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BEGIN:VEVENT
SUMMARY:Hong Wang (IAS)
DTSTART;VALUE=DATE-TIME:20200421T220000Z
DTEND;VALUE=DATE-TIME:20200421T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/1
DESCRIPTION:Title: Distinct distances for well-separated sets\nby Hong Wang (
IAS) as part of UCLA analysis and PDE seminar\n\nLecture held in https://u
cla.zoom.us/j/9264073849.\n\nAbstract\nGiven a set E of dimension s>1\, Fa
lconer conjectured that its distance set \\Delta(E)=\\{|x-y|: x\, y\\in E\
\} should have positive Lebesgue measure. Orponen\, Shmerkin and Keleti-Sh
merkin proved the conjecture for tightly spaced sets\, for example\, AD-re
gular sets.\n\nIn this talk\, we are going to discuss the opposite type: w
ell-separated sets. This is joint work with Larry Guth and Noam Solomon.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ioannis Angelopoulos (Caltech)
DTSTART;VALUE=DATE-TIME:20200421T230000Z
DTEND;VALUE=DATE-TIME:20200422T000000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/2
DESCRIPTION:Title: Semi-global constructions of vacuum spacetimes\nby Ioannis
Angelopoulos (Caltech) as part of UCLA analysis and PDE seminar\n\nLectur
e held in https://ucla.zoom.us/j/9264073849.\n\nAbstract\nI will describe
some techniques for constructing semi-global solutions to the characterist
ic initial value problem for the vacuum Einstein equations with different
types of data\, and will also mention some applications as well as some op
en problems in the area.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Joni Teravainen (Oxford)
DTSTART;VALUE=DATE-TIME:20200428T170000Z
DTEND;VALUE=DATE-TIME:20200428T180000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/3
DESCRIPTION:Title: Higher order uniformity of the Möbius function\nby Joni T
eravainen (Oxford) as part of UCLA analysis and PDE seminar\n\nLecture hel
d in https://ucla.zoom.us/j/9264073849.\n\nAbstract\nRecently\, Matomäki\
, Radziwiłł and Tao showed that the Möbius function is discorrelated wi
th linear exponential phases on almost all short intervals. I will discuss
joint work where we generalize this result to a much wider class of phase
functions\, showing that the Möbius function does not correlate with pol
ynomial phases or more generally with nilsequences. I will also discuss ap
plications to superpolynomial word complexity for the Liouville sequence a
nd to counting polynomial patterns weighted by the Möbius function.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:David Beltran (U. Madison Wisconsin)
DTSTART;VALUE=DATE-TIME:20200505T220000Z
DTEND;VALUE=DATE-TIME:20200505T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/4
DESCRIPTION:Title: Regularity of the centered fractional maximal function\nby
David Beltran (U. Madison Wisconsin) as part of UCLA analysis and PDE sem
inar\n\nLecture held in https://caltech.zoom.us/j/747242458.\n\nAbstract\n
I will report some recent progress regarding the boundedness of the map $f
\\mapsto |\\nabla M_\\beta f|$ from the endpoint space $W^{1\,1}(\\mathbb
{R}^d)$ to $L^{d/(d-\\beta)}(\\mathbb{R}^d)$\, where $M_\\beta$ denotes th
e fractional version of the centered Hardy--Littlewood maximal function. A
key step in our analysis is a pointwise relation between the centered and
non-centered fractional maximal functions at the derivative level\, which
allows to exploit the known techniques in the non-centered case.\n\nThis
is joint work with José Madrid.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Luca Spolaor (UCSD)
DTSTART;VALUE=DATE-TIME:20200505T230000Z
DTEND;VALUE=DATE-TIME:20200506T000000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/5
DESCRIPTION:Title: Regularity of the free boundary for the two-phase Bernoulli pr
oblem\nby Luca Spolaor (UCSD) as part of UCLA analysis and PDE seminar
\n\nLecture held in https://caltech.zoom.us/j/747242458.\n\nAbstract\nI wi
ll describe a recent result obtained in collaboration with G. De Philippis
and B. Velichkov concerning the regularity of the free boundaries in the
two phase Bernoulli problems. The novelty of our work is the analysis of t
he free boundary at branch points\, where we show that it is given by the
union of two C1 graphs. This completes the work started by Alt\, Caffarell
i\, and Friedman in the 80’s.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dmitry Khavinson (U. South Florida)
DTSTART;VALUE=DATE-TIME:20200519T230000Z
DTEND;VALUE=DATE-TIME:20200520T000000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/6
DESCRIPTION:Title: Classical Potential Theory from the High Ground of Linear Holo
morphic PDE\nby Dmitry Khavinson (U. South Florida) as part of UCLA an
alysis and PDE seminar\n\nLecture held in https://ucla.zoom.us/j/926407384
9.\n\nAbstract\n"Between two truths of the real domain\, the easiest and s
hortest path quite often passes through the complex domain."\n\n
P. Painleve\, 1900.\n\n\nAbstract: \n\nNew
ton noticed that the gravitational potential of a spherical mass with cons
tant density equals\, outside the ball\, the potential of the point-mass
at the center. Rephrasing\, the gravitational potential of the ball with
constant mass density continues as a harmonic function inside the ball exc
ept for the center. Fairly recently\, it was noted that the latter stateme
nt holds for any polynomial\, or even for entire densities.\n\nIf a harmon
ic in a spherical shell function vanishes on one piece of a line through t
he center piercing the shell\, then it must vanish on the second piece of
that line. Yet\, the similar statement fails for tori.\n\nIf we solve the
Dirichlet problem in an ellipse with entire data\, the solution will alway
s be an entire harmonic function. Yet\, if we do that in a domain bounded
by the curve x^4 + y^4 =1\, with the data as simple as x^2+y^2\, the solut
ion will have infinitely many singularities outside the curve. \nWhere and
why do eigenfunctions of the Laplacian in domains bounded by algebraic cu
rves start having singularities?\n\nWe shall discuss these and some other
questions under the unified umbrella of analytic continuation of solution
s to analytic pde in C^n.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kirsti Biggs (Chalmers U. Technology)
DTSTART;VALUE=DATE-TIME:20200526T170000Z
DTEND;VALUE=DATE-TIME:20200526T180000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/7
DESCRIPTION:Title: Ellipsephic efficient congruencing for the moment curve\nb
y Kirsti Biggs (Chalmers U. Technology) as part of UCLA analysis and PDE s
eminar\n\nLecture held in https://ucla.zoom.us/j/9264073849.\n\nAbstract\n
An ellipsephic set is a subset of the natural numbers whose elements have
digital restrictions in some fixed prime base. Such sets have a fractal st
ructure and can be viewed as p-adic Cantor sets. The particular ellipsephi
c sets that interest us have certain additive properties - for example\, t
he set of integers whose digits are squares forms a key motivating example
\, because there are few representations of an integer as the sum of two s
quares.\n\n\nWe obtain discrete restriction estimates for the moment curve
over ellipsephic sets—in number theoretic terms\, we bound the number o
f ellipsephic solutions to a Vinogradov system of equations—using Wooley
’s nested efficient congruencing method. These results generalise previo
us work of the speaker\, on the quadratic case of this problem\, to the mo
ment curve of arbitrary degree.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mihailis Kolountzakis (U. Crete)
DTSTART;VALUE=DATE-TIME:20200602T160000Z
DTEND;VALUE=DATE-TIME:20200602T165000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/8
DESCRIPTION:Title: Orthogonal Fourier analysis on domains: methods\, results and
open problems\nby Mihailis Kolountzakis (U. Crete) as part of UCLA ana
lysis and PDE seminar\n\nLecture held in https://caltech.zoom.us/j/7472424
58.\n\nAbstract\nWe all know how to do Fourier Analysis on an interval\, o
n {\\mathbb R}^d\, or other groups. But what if our functions live on a su
bset of Euclidean space\, let's say on a regular hexagon in the plane? Can
we use our beloved exponentials\, functions of the form e_\\lambda(x) = \
\exp(2\\pi i \\lambda\\cdot x) to analyze the functions defined on our dom
ain? In other words\, can we select a set of frequencies \\lambda such tha
t the corresponding exponentials form an orthogonal basis for L^2 of our d
omain? It turns out that the existence of such an orthogonal basis depends
heavily on the domain. So the answer is yes\, we can find an orthogonal b
asis of exponentials for the hexagon\, but if we ask the same question for
a disk\, the answer turns out to be no.\n\nFuglede conjectured in the 197
0s that the existence of such an exponential basis is equivalent to the do
main being able to tile space by translations (the hexagon\, that we menti
oned\, indeed can tile\, while the disk cannot). In this talk we will trac
k this conjecture and the mathematics created by the attempts to settle it
and its variants. We will see some of its rich connections to geometry\,
number theory and harmonic analysis and some of the spectacular recent suc
cesses in our efforts to understand exponential bases. We will emphasize s
everal problems that are still open.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yakov Shlapentokh-Rothman (Princeton)
DTSTART;VALUE=DATE-TIME:20200602T170000Z
DTEND;VALUE=DATE-TIME:20200602T180000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/9
DESCRIPTION:Title: Naked Singularities for the Einstein Vacuum Equations: The Ext
erior Solution\nby Yakov Shlapentokh-Rothman (Princeton) as part of UC
LA analysis and PDE seminar\n\nLecture held in https://caltech.zoom.us/j/7
47242458.\nAbstract: TBA\n\nWe will start by recalling the weak cosmic cen
sorship conjecture. Then we will review Christodoulou's construction of na
ked singularities for the spherically symmetric Einstein-scalar field syst
em. Finally\, we will discuss joint work with Igor Rodnianski which constr
ucts spacetimes corresponding to the exterior region of a naked singularit
y for the Einstein vacuum equations.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kevin Hughes (U. Bristol)
DTSTART;VALUE=DATE-TIME:20200519T220000Z
DTEND;VALUE=DATE-TIME:20200519T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/10
DESCRIPTION:Title: Discrete restriction estimates\nby Kevin Hughes (U. Brist
ol) as part of UCLA analysis and PDE seminar\n\nLecture held in https://uc
la.zoom.us/j/9264073849.\n\nAbstract\nWe will discuss Wooley's Efficient C
ongruencing approach to discrete restriction estimates for translation-dil
ation invariant systems of equations. Then we will discuss recent estimate
s for the curve (X\,X^3) which lie just outside of this framework as well
as that of Decoupling.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stefan Steinerberger (U. Washington)
DTSTART;VALUE=DATE-TIME:20201006T220000Z
DTEND;VALUE=DATE-TIME:20201006T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/11
DESCRIPTION:Title: Roots of polynomials under repeated differentiation: a nonloc
al evolution equation with infinitely many conservation laws (and some uni
versality phenomena)\nby Stefan Steinerberger (U. Washington) as part
of UCLA analysis and PDE seminar\n\n\nAbstract\nSuppose you have a polynom
ial of degree $p_n$ whose $n$ real roots are roughly distributed like a Ga
ussian (or some other nice distribution) and you differentiate $t\\cdot n$
times where $0< t<1$. What's the distribution of the $(1-t)n$ roots of th
at $(t\\cdot n)$-th derivative? How does it depend on $t$? We identify a
relatively simple nonlocal evolution equation (the nonlocality is given by
a Hilbert transform)\; it has two nice closed-form solutions\, a shrinkin
g semicircle and a family of Marchenko-Pastur distributions (this sounds l
ike random matrix theory and we make some remarks in that direction). More
over\, the underlying evolution satisfies an infinite number of conservati
on laws that one can write down explicitly. This suggests a lot of questio
ns: Sean O'Rourke and I proposed an analogous equation for complex-valued
polynomials. Motivated by some numerical simulations\, Jeremy Hoskins and
I conjectured that $t=1$\, just before the polynomial disappears\, the sh
ape of the remaining roots is a semicircle and we prove that for a class o
f random polynomials. I promise lots of open problems and pretty pictures
.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bjoern Bringmann (UCLA)
DTSTART;VALUE=DATE-TIME:20201006T230000Z
DTEND;VALUE=DATE-TIME:20201007T000000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/12
DESCRIPTION:Title: Invariant Gibbs measures for the three-dimensional wave equat
ion with a Hartree nonlinearity\nby Bjoern Bringmann (UCLA) as part of
UCLA analysis and PDE seminar\n\n\nAbstract\nIn this talk\, we discuss th
e construction and invariance of the Gibbs measure for a three-\ndimension
al wave equation with a Hartree-nonlinearity.\n\nIn the first part of the
talk\, we construct the Gibbs measure and examine its properties. We discu
ss the mutual singularity of the Gibbs measure and the so-called Gaussian
free field. In contrast\, the Gibbs measure for one or two-dimensional wav
e equations is absolutely continuous with respect to the Gaussian free fie
ld.\n\nIn the second part of the talk\, we discuss the probabilistic well-
posedness of the corresponding nonlinear wave equation\, which is needed i
n the proof of invariance. At the moment\, this is the only theorem provin
g the invariance of any singular Gibbs measure under a dispersive equation
.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Khang Huynh (UCLA)
DTSTART;VALUE=DATE-TIME:20201020T220000Z
DTEND;VALUE=DATE-TIME:20201020T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/13
DESCRIPTION:Title: A geometric trapping approach to global regularity for 2D Nav
ier-Stokes on manifolds\nby Khang Huynh (UCLA) as part of UCLA analysi
s and PDE seminar\n\n\nAbstract\nWe use frequency decomposition techniques
to give a direct proof of global existence and regularity for the Navier-
Stokes equations on two-dimensional Riemannian manifolds without boundary.
Our techniques are inspired by an approach of Mattingly and Sinai which w
as developed in the context of periodic boundary conditions on a flat back
ground\, and which is based on a maximum principle for Fourier coefficient
s. The extension to general manifolds requires several new ideas\, connect
ed to the less favorable spectral localization properties in our setting.
Our arguments make use of frequency projection operators\, multilinear est
imates that originated in the study of the non-linear Schrodinger equation
\, and ideas from microlocal analysis.\n\nThis is joint work with Aynur Bu
lut.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/13/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jaemin Park (Georgia Tech)
DTSTART;VALUE=DATE-TIME:20201013T210000Z
DTEND;VALUE=DATE-TIME:20201013T220000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/14
DESCRIPTION:Title: Radial symmetry in stationary/uniformly-rotating solutions to
2D Euler equation\nby Jaemin Park (Georgia Tech) as part of UCLA anal
ysis and PDE seminar\n\n\nAbstract\nIn this talk\, I will discuss whether
all stationary/uniformly-rotating solutions of 2D Euler equation must be r
adially symmetric\, if the vorticity is compactly supported. For a station
ary solution that is either smooth or of patch type\, we prove that if the
vorticity does not change sign\, it must be radially symmetric up to a tr
anslation. It turns out that the fixed-sign condition is necessary for rad
ial symmetry result: indeed\, we are able to find non-radial sign changing
stationary solution with compact support. We have also obtained some shar
p criteria on symmetry for uniformly-rotating solutions for 2D Euler equat
ion and the SQG equation. The symmetry results are mainly obtained by calc
ulus of variations and elliptic equation techniques\, and the construction
of non-radial solution is obtained from bifurcation theory. Part of this
talk is based on joint work with Javier Gomez-Serrano\, Jia Shi and Yao Ya
o\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/14/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thomas Bloom (Cambridge)
DTSTART;VALUE=DATE-TIME:20201103T180000Z
DTEND;VALUE=DATE-TIME:20201103T190000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/15
DESCRIPTION:Title: Spectral structure and arithmetic progressions\nby Thomas
Bloom (Cambridge) as part of UCLA analysis and PDE seminar\n\n\nAbstract\
nHow much additive structure can we guarantee in sets of integers\, knowin
g only their density? The study of which density thresholds are sufficient
to guarantee the existence of various kinds of additive structures is an
old and fascinating subject with connections to analytic number theory\, a
dditive combinatorics\, and harmonic analysis.\n\nIn this talk we will dis
cuss recent progress on perhaps the most well-known of these thresholds: h
ow large do we need a set of integers to be to guarantee the existence of
a three-term arithmetic progression? In recent joint work with Olof Sisask
we broke through the logarithmic density barrier for this problem\, estab
lishing in particular that if a set is dense enough such that the sum of r
eciprocals diverges\, then it must contain a three-term arithmetic progres
sion\, establishing the first case of an infamous conjecture of Erdos.\n\n
We will give an introduction to this problem and sketch some of the recent
ideas that have made this progress possible. We will pay particular atten
tion to the ways we exploit 'spectral structure' - understanding combinato
rially sets of large Fourier coefficients\, which we hope will have furthe
r applications in number theory and harmonic analysis.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/15/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yao Yao (Georgia Tech)
DTSTART;VALUE=DATE-TIME:20201118T000000Z
DTEND;VALUE=DATE-TIME:20201118T010000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/16
DESCRIPTION:Title: Two results on the interaction energy\nby Yao Yao (Georgi
a Tech) as part of UCLA analysis and PDE seminar\n\n\nAbstract\nFor any no
nnegative density $f$ and radially decreasing interaction potential $W$\,
the celebrated Riesz rearrangement inequality shows the interaction energy
$E[f] = \\int f(x)f(y)W(x-y) dxdy$ satisfies $E[f] \\leq E[f^*]$\, where
$f^*$ is the radially decreasing rearrangement of $f$. It is a natural que
stion to look for a quantitative version of this inequality: if its two si
des almost agree\, how close must $f$ be to a translation of $f^*$? Previo
usly the stability estimate was only known for characteristic functions. I
will discuss a recent work with Xukai Yan\, where we found a simple proof
of stability estimates for general densities. \n\nI will also discuss ano
ther work with Matias Delgadino and Xukai Yan\, where we constructed an in
terpolation curve between any two radially decreasing densities with the s
ame mass\, and show that the interaction energy is convex along this inter
polation. As an application\, this leads to uniqueness of steady states in
aggregation-diffusion equations with any attractive interaction potential
for diffusion power $m\\geq 2$\, where the threshold is sharp.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/16/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jared Speck (Vanderbilt)
DTSTART;VALUE=DATE-TIME:20201020T230000Z
DTEND;VALUE=DATE-TIME:20201021T000000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/17
DESCRIPTION:Title: Stable big bang formation in general relativity: the complete
sub-critical regime\nby Jared Speck (Vanderbilt) as part of UCLA anal
ysis and PDE seminar\n\n\nAbstract\nThe celebrated theorems of Hawking and
Penrose show that under appropriate assumptions on the matter model\, a l
arge\, open set of initial data for Einstein's equations lead to geodesica
lly incomplete solutions. However\, these theorems are "soft" in that they
do not yield any information\nabout the nature of the incompleteness\, le
aving open the possibilities that \n\ni) it is tied to the blowup of some
invariant quantity (such as curvature) or \n\nii) it is due to a more sini
ster phenomenon\, such as\nincompleteness due to lack of information for h
ow to uniquely continue the solution (this is roughly\nknown as the format
ion of a Cauchy horizon). \n\nDespite the "general ambiguity" in the mathe
matical physics literature\, there are heuristic results\, going back 50 y
ears\, suggesting that whenever a certain "sub-criticality" condition hold
s\, the Hawking-Penrose incompleteness is caused by the formation of a Big
Bang singularity\, that is\, curvature blowup along an entire spacelike h
ypersurface. In\nrecent joint work with I. Rodnianski and G. Fournodavlos\
, we have given a rigorous proof of the heuristics. More precisely\, our r
esults apply to Sobolev-class perturbations - without symmetry - of genera
lized Kasner solutions whose exponents satisfy the sub-criticality conditi
on. Our main\ntheorem shows that - like the generalized Kasner solutions -
the perturbed solutions develop Big Bang singularities. \n\nIn this talk\
, I will provide an overview of our result and explain how it is tied to s
ome of the main themes of investigation by the mathematical general relati
vity community\, including the remarkable work of Dafermos-Luk on the stab
ility of Kerr Cauchy horizons. I will also discuss the new gauge that we u
sed in our work\, as well as intriguing connections to other problems conc
erning stable singularity formation.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/17/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Aleksandr Logunov (Princeton)
DTSTART;VALUE=DATE-TIME:20201215T190000Z
DTEND;VALUE=DATE-TIME:20201215T200000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/18
DESCRIPTION:Title: Zero sets of Laplace eigenfunctions\nby Aleksandr Logunov
(Princeton) as part of UCLA analysis and PDE seminar\n\n\nAbstract\nIn th
e beginning of 19th century Napoleon set a prize for the best mathematical
explanation of Chladni’s resonance experiments. Nodal geometry studies
the zeroes of solutions to elliptic differential equations such as the vis
ible curves that appear in these physical experiments. We will discuss geo
metrical and analytic properties of zero sets of harmonic functions and ei
genfunctions of the Laplace operator. For harmonic functions on the plane
there is an interesting relation between local length of the zero set and
the growth of harmonic functions. The larger the zero set is\, the faster
the growth of harmonic function should be and vice versa. Zero sets of Lap
lace eigenfunctions on surfaces are unions of smooth curves with equiangul
ar intersections. Topology of the zero set could be quite complicated\, bu
t Yau conjectured that the total length of the zero set is comparable to t
he square root of the eigenvalue for all eigenfunctions. We will start wit
h open questions about spherical harmonics and explain some methods to stu
dy nodal sets.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/18/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cristian Gonzales-Riquelme (IMPA)
DTSTART;VALUE=DATE-TIME:20201117T230000Z
DTEND;VALUE=DATE-TIME:20201118T000000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/19
DESCRIPTION:Title: BV and Sobolev continuity for maximal operators\nby Crist
ian Gonzales-Riquelme (IMPA) as part of UCLA analysis and PDE seminar\n\n\
nAbstract\nThe regularity of maximal operators has been a topic of\nintere
st in harmonic analysis over the past decades. In this topic we are intere
sted in what can be said about the variation of a maximal function Mf give
n some information about the original function f. In this talk we present\
nsome recent results about the continuity of the map $f \\mapsto \\nabla M
f$ for the uncentered Hardy-Littlewood maximal operator in both the $BV({\
\mathbb R})$ and the $W^{1\,1}_{rad}({\\mathbb R}^d)$ settings.\n\nThis is
based on joint works with D. Kosz (BV case) and E. Carneiro and J. Madrid
(radial case).\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/19/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Paata Ivanisvili (NC State)
DTSTART;VALUE=DATE-TIME:20201201T230000Z
DTEND;VALUE=DATE-TIME:20201202T000000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/20
DESCRIPTION:Title: Sharpening the triangle inequality in Lp spaces\nby Paata
Ivanisvili (NC State) as part of UCLA analysis and PDE seminar\n\n\nAbstr
act\nThe classical triangle inequality in Lp estimates the norm of the sum
of two functions in terms of the sums of the norms of these functions. Pe
rhaps one drawback of this estimate is that it does not see how "orthogona
l" these functions are. For example\, if f and g are not identically zero
and they have disjoint supports then the triangle inequality is pretty str
ict (say for p>1).\n\nMotivated by the L2 case\, where one has a trivial i
nequality ||f+g||^2 \\leq ||f||^2 + ||g||^2 + 2 |fg|_1\, one can think abo
ut the quantity |fg|_1 as measuring the "overlap" between f and g. What is
the correct analog of this estimate in Lp for p different than 2?\n\nMy t
alk will be based on a joint work with Carlen\, Frank and Lieb where we ob
tain one extension of this estimate in Lp\, thereby proving and improving
the suggested possible estimates by Carbery\, and another work with Mooney
where we further refine these estimates. The estimates will be provided f
or all real p's.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/20/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Emanuel Carneiro (ICTP)
DTSTART;VALUE=DATE-TIME:20201215T180000Z
DTEND;VALUE=DATE-TIME:20201215T190000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/21
DESCRIPTION:Title: Uncertain signs\nby Emanuel Carneiro (ICTP) as part of UC
LA analysis and PDE seminar\n\n\nAbstract\nWe consider a generalized versi
on of the sign uncertainty\nprinciple for the Fourier transform\, first pr
oposed by Bourgain\, Clozel and\nKahane in 2010 and revisited by Cohn and
Gonçalves in 2019\, in connection\nto the sphere packing problem. In our
setup\, the signs of a function and\nits Fourier transform resonate with a
generic given function P outside of\na ball. One essentially wants to kno
w if and how soon this resonance can\nhappen\, when facing a suitable comp
eting weighted integral condition. The\noriginal version of the problem co
rresponds to the case P=1.\nSurprisingly\, even in such a rough setup\, we
are able to identify sharp\nconstants in some cases. This is a joint work
with Oscar Quesada-Herrera\n(IMPA - Rio de Janeiro).\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/21/
END:VEVENT
BEGIN:VEVENT
SUMMARY:David Damanik (Rice)
DTSTART;VALUE=DATE-TIME:20201202T000000Z
DTEND;VALUE=DATE-TIME:20201202T010000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/22
DESCRIPTION:Title: Proving Positive Lyapunov Exponents: Beyond Independence\
nby David Damanik (Rice) as part of UCLA analysis and PDE seminar\n\n\nAbs
tract\nWe discuss the problem of proving the positivity of the Lyapunov ex
ponent for Schr\\"odinger operators with potentials defined by a hyperboli
c base transformation and a H \\"older continuous sampling function. Promi
nent examples of such base transformations are given by the doubling map a
nd the Arnold cat map. The talk is based on joint work with Artur Avila an
d Zhenghe Zhang.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/22/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shukun Wu (UIUC)
DTSTART;VALUE=DATE-TIME:20201027T210000Z
DTEND;VALUE=DATE-TIME:20201027T220000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/23
DESCRIPTION:Title: On the Bochner-Riesz problem in dimension 3\nby Shukun Wu
(UIUC) as part of UCLA analysis and PDE seminar\n\n\nAbstract\nWe improve
the Bochner-Riesz conjecture in dimension 3 to p>3.25. The main method we
used is the iterated polynomial partitioning algorithm. We also observe s
ome relations between wave packets at different scales.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/23/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yilin Wang (MIT)
DTSTART;VALUE=DATE-TIME:20201208T220000Z
DTEND;VALUE=DATE-TIME:20201208T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/24
DESCRIPTION:Title: SLE\, energy duality\, and foliations by Weil-Petersson quasi
circles\nby Yilin Wang (MIT) as part of UCLA analysis and PDE seminar\
n\n\nAbstract\nThe Loewner energy for Jordan curves first arises from the
small-parameter large deviations of Schramm-Loewner evolution (SLE). It is
finite if and only if the curve is a Weil-Petersson quasicircle\, an inte
resting class of Jordan curves appearing in Teichmuller theory\, geometric
function theory\, and string theory with currently more than 20 equivalen
t definitions. In this talk\, I will show that the large-parameter large d
eviations of SLE gives rise to a new Loewner-Kufarev energy\, which is dua
l to the Loewner energy via foliations by Weil-Petersson quasicircles and
exhibits remarkable features and symmetries. Based on joint works with Mor
ris Ang and Minjae Park (MIT) and with Fredrik Viklund (KTH).\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/24/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thomas Beck (Fordham)
DTSTART;VALUE=DATE-TIME:20201103T190000Z
DTEND;VALUE=DATE-TIME:20201103T200000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/25
DESCRIPTION:Title: Two-phase free boundary problems and the Friedland-Hayman ine
quality\nby Thomas Beck (Fordham) as part of UCLA analysis and PDE sem
inar\n\n\nAbstract\nThe Friedland-Hayman inequality provides a lower bound
on the first Dirichlet eigenvalues of complementary subsets of the sphere
. In this talk\, we will describe a variant of this inequality to geodesic
ally convex subsets of the sphere with mixed Dirichlet-Neumann boundary co
nditions. Using this inequality\, we prove an almost-monotonicity formula
and Lipschitz continuity up to the boundary for the minimizer of a two-pha
se free boundary problem. This is joint work with David Jerison and Sarah
Raynor.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/25/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Adrian Nachman (U. Toronto)
DTSTART;VALUE=DATE-TIME:20201110T220000Z
DTEND;VALUE=DATE-TIME:20201110T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/26
DESCRIPTION:Title: A Nonlinear Plancherel Theorem with Applications to Global We
ll-posedness for the Defocusing Davey-Stewartson Equation and to the Inver
se Boundary Value Problem of Calderon\nby Adrian Nachman (U. Toronto)
as part of UCLA analysis and PDE seminar\n\n\nAbstract\nThis is joint work
with Idan Regev and Daniel Tataru.\n\nThe talk will aim to present our so
lutions to 2+\\epsilon open problems.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/26/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Justin Forlano (UCLA)
DTSTART;VALUE=DATE-TIME:20201124T220000Z
DTEND;VALUE=DATE-TIME:20201124T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/27
DESCRIPTION:Title: Normal form approach to the one-dimensional cubic nonlinear S
chr\\"{o}dinger equation in almost critical spaces\nby Justin Forlano
(UCLA) as part of UCLA analysis and PDE seminar\n\n\nAbstract\nIn recent y
ears\, the normal form approach has provided an alternative method to esta
blishing the well-posedness of solutions to nonlinear dispersive PDEs\, as
compared to using heavy machinery from harmonic analysis. In this talk\,
I will describe how to apply the normal form approach to study the one-dim
ensional cubic nonlinear Schr\\"{o}dinger equation (NLS) on the real-line
and prove local well-posedness in almost critical Fourier-amalgam spaces.
This involves using an infinite iteration of normal form reductions (namel
y\, integration by parts in time) to derive the normal form equation\, whi
ch behaves better than NLS for rough functions.\n\nThis is joint work with
Tadahiro Oh (U. Edinburgh).\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/27/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alexander Dobner (UCLA)
DTSTART;VALUE=DATE-TIME:20210106T000000Z
DTEND;VALUE=DATE-TIME:20210106T010000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/28
DESCRIPTION:Title: Extreme values of the argument of the zeta function\nby A
lexander Dobner (UCLA) as part of UCLA analysis and PDE seminar\n\n\nAbstr
act\nLet $S(t) = \\frac{1}{\\pi}\\Im \\log \\zeta(\\frac{1}{2}+it)$. The b
ehavior of this function is intimately connected to irregularities in the
locations of the zeros of the zeta function. In particular $S(t)$ measures
the difference between the "expected" number of zeta zeros up to height $
t$ and the actual number of such zeros. I will discuss what is known about
the distribution of $S(t)$ and prove a new unconditional lower bound on h
ow often $S(t)$ achieves large values.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/28/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Eugenia Malinnikova (Stanford)
DTSTART;VALUE=DATE-TIME:20210126T220000Z
DTEND;VALUE=DATE-TIME:20210126T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/29
DESCRIPTION:Title: Landis’ conjecture on the decay of solutions to Schrödinge
r equations on the plane.\nby Eugenia Malinnikova (Stanford) as part o
f UCLA analysis and PDE seminar\n\n\nAbstract\nWe consider a real-valued f
unction on the plane for which the absolute value of the Laplacian is boun
ded by the absolute value of the function at each point. In other words\,
we look at solutions of the stationary Schrödinger equation with a bounde
d potential. The question discussed in the talk is how fast such function
may decay at infinity. We give the answer in dimension two\, in higher dim
ensions the corresponding problem is open.\n\n \n\nThe talk is based on th
e joint work with A. Logunov\, N. Nadirashvili\, and F. Nazarov.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/29/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yufei Zhao (MIT)
DTSTART;VALUE=DATE-TIME:20210120T000000Z
DTEND;VALUE=DATE-TIME:20210120T010000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/30
DESCRIPTION:Title: Joints of varieties\nby Yufei Zhao (MIT) as part of UCLA
analysis and PDE seminar\n\n\nAbstract\nWe generalize the Guth-Katz joints
theorem from lines to varieties. A special case of our result says that $
N$ planes (2-flats) in 6 dimensions (over any field) have $O(N^{3/2})$ joi
nts\, where a joint is a point contained in a triple of these planes not a
ll lying in some hyperplane. Our most general result gives upper bounds\,
tight up to constant factors\, for joints with multiplicities for several
sets of varieties of arbitrary dimensions (known as Carbery's conjecture).
Our main innovation is a new way to extend the polynomial method to highe
r dimensional objects.\n\nJoint work with Jonathan Tidor and Hung-Hsun Han
s Yu.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/30/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Georgis Moschidis (UC Berkeley)
DTSTART;VALUE=DATE-TIME:20210112T180000Z
DTEND;VALUE=DATE-TIME:20210112T190000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/31
DESCRIPTION:Title: The instability of Anti-de Sitter spacetime for the Einstein-
scalar field system\nby Georgis Moschidis (UC Berkeley) as part of UCL
A analysis and PDE seminar\n\n\nAbstract\nhe AdS instability conjecture pr
ovides an example of weak turbulence appearing in the dynamics of the Eins
tein equations in the presence of a negative cosmological constant. The co
njecture claims the existence of arbitrarily small perturbations to the in
itial data of Anti-de Sitter spacetime which\, under evolution by the vacu
um Einstein equations with reflecting boundary conditions at conformal in
finity\, lead to the formation of black holes after sufficiently long time
. \n In this talk\, I will present a rigorous proof of the AdS instabil
ity conjecture in the setting of the spherically symmetric Einstein-scala
r field system. The construction of the unstable initial data will require
carefully designing a family of initial configurations of localized matte
r beams and estimating the exchange of energy taking place between interac
ting beams over long periods of time\, as well as estimating the decoheren
ce rate of those beams. I will also discuss possible paths for extending t
hese ideas to the vacuum case.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/31/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Elena Giorgi (Princeton)
DTSTART;VALUE=DATE-TIME:20210116T000000Z
DTEND;VALUE=DATE-TIME:20210116T010000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/32
DESCRIPTION:Title: Electromagnetic-gravitational perturbations of Kerr-Newman sp
acetime\nby Elena Giorgi (Princeton) as part of UCLA analysis and PDE
seminar\n\n\nAbstract\nThe Kerr-Newman spacetime is the most general expli
cit black hole solution\, and represents a stationary rotating charged bla
ck hole. Its stability to gravitational and electromagnetic perturbations
has eluded a proof since the 80s in the black hole perturbation community\
, because of "the apparent indissolubility of the coupling between the spi
n-1 and spin-2 fields in the perturbed spacetime"\, as put by Chandrasekha
r. We will present a derivation of the Teukolsky and Regge-Wheeler equatio
ns in Kerr-Newman in physical space and use it to obtain a quantitative pr
oof of stability.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/32/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Betsy Stovall (UW-Madison)
DTSTART;VALUE=DATE-TIME:20210302T190000Z
DTEND;VALUE=DATE-TIME:20210302T200000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/33
DESCRIPTION:Title: Existence of extremizers for Fourier restriction operators\nby Betsy Stovall (UW-Madison) as part of UCLA analysis and PDE seminar\
n\n\nAbstract\nWe learn in first year graduate analysis that an operator f
rom one Banach space to another is continuous if and only if the image of
the unit ball is a bounded set. In this talk\, we will discuss the questio
n of whether this image has a point of maximal norm\, in the specific cont
ext of certain Fourier restriction operators.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/33/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marta Lewicka (U. Pittsburgh)
DTSTART;VALUE=DATE-TIME:20210109T000000Z
DTEND;VALUE=DATE-TIME:20210109T010000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/34
DESCRIPTION:Title: Expansions of averaging operators and applications\nby Ma
rta Lewicka (U. Pittsburgh) as part of UCLA analysis and PDE seminar\n\n\n
Abstract\nhe following approach of finding solutions to a partial differen
tial equation Lu=0\, proved to be quite versatile:\n\n(i) develop an asymp
totic expansion of a suitable family of averaging operators (to be applied
on u)\; the operators are parametrized by the radius \\epsilon of averagi
ng\, and the coefficient in the expansion that multiplies the appropriate
power of \\epsilon should equal Lu\, the "appropriate power" refers to the
order of L\;\n\n(ii) study the related mean value equation by removing hi
gher order terms in the expansion\;\n\n(iii) interpret the mean value equa
tion as the dynamic programming principle of a two-player game incorporati
ng deterministic and stochastic components\;\n\n(iv) pass to the limit in
the radius of averaging \\epsilon\, in order to recover solutions to Lu=0
from the values of the game process.\n\nIn my talk\, I will explain this a
pproach in the contexts of p-Laplacian and the non-local geometric p-Lapla
cian. Other applications include: Robin boundary conditions and weighted L
aplace-Beltrami operator on a manifold. In each case\, finding the appropr
iate averaging principle is the key starting point in order to develop (i)
-(iv).\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/34/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Philip T. Gressman (UPenn)
DTSTART;VALUE=DATE-TIME:20210105T230000Z
DTEND;VALUE=DATE-TIME:20210106T000000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/35
DESCRIPTION:Title: Radon-like Transforms\, Geometric Measures\, and Invariant Th
eory\nby Philip T. Gressman (UPenn) as part of UCLA analysis and PDE s
eminar\n\n\nAbstract\nFourier restriction\, Radon-like operators\, and dec
oupling theory are three active areas of harmonic analysis which involve s
ubmanifolds of Euclidean space in a fundamental way. In each case\, the ma
pping properties of the objects of study depend in a fundamental way on th
e "non-flatness" of the submanifold\, but with the exception of certain ex
treme cases (primarily curves and hypersurfaces)\, it is not clear exactly
how to quantify the geometry in an analytically meaningful way. In this t
alk\, I will discuss a series of recent results which shed light on this s
ituation using tools from an unusually broad range of mathematical sources
.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/35/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sigurd Angenent (UW-Madison)
DTSTART;VALUE=DATE-TIME:20210202T230000Z
DTEND;VALUE=DATE-TIME:20210203T000000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/36
DESCRIPTION:Title: Nonunique evolution through cones in Mean Curvature Flow and
Ricci Flow\nby Sigurd Angenent (UW-Madison) as part of UCLA analysis a
nd PDE seminar\n\n\nAbstract\nFor any integer $k>1$ there exist smooth sol
utions $M_t$ ($t<0$) of MCF that form a one-point singularity at time $t=0
$\, after which there exist at least $2k$ forward evolutions $M_t^1\, \\do
ts\, M_t^k\, N_t^1\, \\dots\, N_t^k$ ($t>0$) by the flow. The solutions $
M_t^j$ and $N_t^j$ are topologically distinct. The analogous statement f
or Ricci Flow also holds\, and I will explain both.\n\nBuilding on these s
elf similar solutions to MCF\, I will also describe non-self similar solut
ions that have a given cone as their initial data. One conclusion is that
for any $k>1$ there is a smooth self similar solution to MCF that forms a
one point singularity\, and for which the set of possible smooth forward
evolutions contains a k-dimensional continuum. Another conclusion is that
the set of smooth solutions to MCF whose initial condition is one of the
stationary cones in $\\mathbb{R}^n$ ($n\\in\\{4\, 5\, 6\, 7\\}$) is infini
te dimensional .\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/36/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cyrill Muratov (New Jersey Institute of Technology)
DTSTART;VALUE=DATE-TIME:20210302T180000Z
DTEND;VALUE=DATE-TIME:20210302T190000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/37
DESCRIPTION:Title: Magnetic skyrmions in the conformal limit\nby Cyrill Mura
tov (New Jersey Institute of Technology) as part of UCLA analysis and PDE
seminar\n\n\nAbstract\nWe characterize skyrmions in ultrathin ferromagneti
c films as local minimizers of a reduced micromagnetic energy appropriate
for quasi two-dimensional materials with perpendicular magnetic anisotropy
and interfacial Dzyaloshinskii-Moriya interaction. The minimization is ca
rried out in a suitable class of two-dimensional magnetization configurati
ons that prevents the energy from going to negative infinity\, while not i
mposing any restrictions on the spatial scale of the configuration. We fir
st demonstrate existence of minimizers for an explicit range of the model
parameters when the energy is dominated by the exchange energy. We then in
vestigate the conformal limit\, in which only the exchange energy survives
and identify the asymptotic profiles of the skyrmions as degree $1$ harmo
nic maps from the plane to the sphere\, together with their radii\, angles
and energies. A byproduct of our analysis is a quantitative rigidity resu
lt for degree $\\pm 1$ harmonic maps from the two-dimensional sphere to it
self.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/37/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hong Wang (IAS)
DTSTART;VALUE=DATE-TIME:20210115T230000Z
DTEND;VALUE=DATE-TIME:20210116T000000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/38
DESCRIPTION:Title: Restriction theory in Fourier analysis\nby Hong Wang (IAS
) as part of UCLA analysis and PDE seminar\n\n\nAbstract\nIf a function ha
s Fourier transform supported on a sphere\, what can we say about this fun
ction?\n\nGiven a collection of long thin tubes pointing in different dire
ctions\, how much do they overlap?\n\nThese two questions are closely rela
ted. In this talk\, we will discuss how understanding the second question
leads to progress on the first one. More precisely\, we will discuss Stein
's restriction conjecture and Sogge's local smoothing conjecture for the w
ave equation.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/38/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tsviqa Lakrec (U. Jerusalem)
DTSTART;VALUE=DATE-TIME:20210216T180000Z
DTEND;VALUE=DATE-TIME:20210216T190000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/39
DESCRIPTION:Title: Equidistribution of affine random walks on some nilmanifolds<
/a>\nby Tsviqa Lakrec (U. Jerusalem) as part of UCLA analysis and PDE semi
nar\n\n\nAbstract\nWe consider the action of the group of affine transform
ations on a nilmanifold. \nGiven a probability measure on this group and a
starting point $x$\, a random walk on the nilmanifold is defined. \nWe st
udy quantitative equidistribution in law of such affine random walks on ni
lmanifolds. \nUnder certain assumptions\, we show that a failure to have f
ast equidistribution on a nilmanifold is due to a failure on some factor n
ilmanifold. \nCombined with equidistribution results on the torus\, this l
eads to an equidistribution statement on some nilmanifolds\, such as Heise
nberg nilmanifolds.\n\nThis talk is based on joint works with Weikun He an
d Elon Lindenstrauss.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/39/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Benjamin Seeger (College de France)
DTSTART;VALUE=DATE-TIME:20210111T230000Z
DTEND;VALUE=DATE-TIME:20210112T000000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/40
DESCRIPTION:Title: Interpolation results for pathwise Hamilton-Jacobi equations<
/a>\nby Benjamin Seeger (College de France) as part of UCLA analysis and P
DE seminar\n\n\nAbstract\nI will show how interpolation methods can be use
d to make sense of pathwise Hamilton-Jacobi equations for a wide range of
Hamiltonians and driving paths. The various function spaces describe regul
arity (including Sobolev\, Besov\, Holder\, and variation) as well as stru
cture. I will also discuss some criteria for a function to be representabl
e as a difference of convex functions\, a class which plays an important r
ole in the theory of pathwise Hamilton-Jacobi equations.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/40/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Andreia Chapouto (U. Edinburgh)
DTSTART;VALUE=DATE-TIME:20210112T170000Z
DTEND;VALUE=DATE-TIME:20210112T180000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/41
DESCRIPTION:Title: Invariance of the Gibbs measures for the periodic generalized
KdV equations\nby Andreia Chapouto (U. Edinburgh) as part of UCLA ana
lysis and PDE seminar\n\n\nAbstract\nIn this talk\, we consider the period
ic generalized Korteweg-de Vries equations (gKdV). In particular\, we stud
y gKdV with the Gibbs measure initial data. The main difficulty lies in co
nstructing local-in-time dynamics in the support of the measure. Since gKd
V is analytically ill-posed in the $L^2$-based Sobolev support\, we instea
d prove deterministic local well-posedness in some Fourier-Lebesgue spaces
containing the support of the Gibbs measures. New key ingredients are bil
inear and trilinear Strichartz estimates adapted to the Fourier-Lebesgue s
etting. Once we construct local-in-time dynamics\, we apply Bourgain's inv
ariant measure argument to prove almost sure global well-posedness of the
defocusing gKdV with respect to the Gibbs measure and invariance of the Gi
bbs measure under the gauged gKdV dynamics.\n\nThis talk is based on joint
work with Nobu Kishimoto (RIMS\, University of Kyoto).\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/41/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kihyun Kim (KAIST)
DTSTART;VALUE=DATE-TIME:20210129T230000Z
DTEND;VALUE=DATE-TIME:20210130T000000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/42
DESCRIPTION:Title: Blow-up dynamics for the self-dual Chern-Simons-Schrödinger
equation\nby Kihyun Kim (KAIST) as part of UCLA analysis and PDE semin
ar\n\n\nAbstract\nWe consider the blow-up dynamics of the self-dual Chern-
Simons-Schrödinger equation (CSS) under equivariance symmetry. (CSS) is $
L^2$-critical\, has the pseudoconformal symmetry\, and admits a soliton $Q
$ for each equivariance index $m \\geq 0$. An application of the pseudocon
formal transformation to $Q$ yields an explicit finite-time blow-up soluti
on $S(t)$ which contracts at the pseudoconformal rate $|t|$. In the high e
quivariance case $m \\geq 1$\, the pseudoconformal blow-up for smooth fini
te energy solutions in fact occurs in a codimension one sense\; it is stab
le under a codimension one perturbation\, but also exhibits an instability
mechanism. In the radial case $m=0$\, however\, $S(t)$ is no longer a fin
ite energy blow-up solution. Interestingly enough\, there are smooth finit
e energy blow-up solutions whose blow-up rates differ from the pseudoconfo
rmal rate by a power of logarithm. We will explore these interesting blow-
up dynamics (with more focus on the latter) via modulation analysis. This
talk is based on my joint works with Soonsik Kwon and Sung-Jin Oh.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/42/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Adi Glucksam (U. Toronto)
DTSTART;VALUE=DATE-TIME:20210119T230000Z
DTEND;VALUE=DATE-TIME:20210120T000000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/43
DESCRIPTION:Title: Stationary random entire functions and related questions\
nby Adi Glucksam (U. Toronto) as part of UCLA analysis and PDE seminar\n\n
\nAbstract\nThe complex plane acts on the space of entire function by tran
slations\, taking f(z) to f(z+w). B.Weiss showed in `97 that there exists
a probability measure defined on the space of entire functions\, which is
invariant under this action. In this talk I will present optimal bounds on
the minimal possible growth of functions in the support of such measures
and discuss other growth-related problems inspired by this work. In partic
ular\, I will focus on the question of minimal possible growth-rate of fre
quently oscillating subharmonic functions.\nThe talk is partly based on a
joint work with L. Buhovsky\, A. Logunov\, and M. Sodin.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/43/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Polona Durcik (Chapman University)
DTSTART;VALUE=DATE-TIME:20210203T000000Z
DTEND;VALUE=DATE-TIME:20210203T010000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/44
DESCRIPTION:Title: Multilinear singular and oscillatory integrals and applicatio
ns\nby Polona Durcik (Chapman University) as part of UCLA analysis and
PDE seminar\n\n\nAbstract\nWe give an overview of some recent results in
the area of multilinear singular and oscillatory integrals. We discuss the
ir connection with certain questions about point configurations in subsets
of the Euclidean space and convergence of some ergodic averages. Based on
joint works with Michael Christ\, Vjekoslav Kovac\, and Joris Roos.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/44/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Felipe Goncalves (Bonn)
DTSTART;VALUE=DATE-TIME:20210216T190000Z
DTEND;VALUE=DATE-TIME:20210216T200000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/45
DESCRIPTION:Title: Sign Uncertainty\nby Felipe Goncalves (Bonn) as part of U
CLA analysis and PDE seminar\n\n\nAbstract\nI will talk about some of the
recent developments of the sign\nuncertainty principle and its relation wi
th sphere packings and modular\nforms\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/45/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lillian Pierce (Duke)
DTSTART;VALUE=DATE-TIME:20210319T220000Z
DTEND;VALUE=DATE-TIME:20210319T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/46
DESCRIPTION:Title: Counterexamples for high-degree analogues of the Schrödinger
maximal operator\nby Lillian Pierce (Duke) as part of UCLA analysis a
nd PDE seminar\n\n\nAbstract\nIn 1980 Carleson posed a question on the min
imal regularity of an initial data function that implies pointwise converg
ence for the solution of the linear Schrodinger equation. After progress b
y many authors\, this was recently resolved (up to the endpoint) by Bourga
in\, whose counterexample construction for the Schrodinger maximal operato
r proved a necessary condition on the regularity\, and Du and Zhang\, who
proved a sufficient condition. In this talk we describe how Bourgain's cou
nterexamples can be constructed from first principles. Then we describe a
new flexible number-theoretic method for constructing counterexamples\, wh
ich proves a necessary condition for high-degree analogues of the Schrodin
ger maximal operator to be bounded from H^s to\nlocal L^1.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/46/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Darren King (U. Texas)
DTSTART;VALUE=DATE-TIME:20210316T210000Z
DTEND;VALUE=DATE-TIME:20210316T220000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/47
DESCRIPTION:Title: A capillarity model for soap films\nby Darren King (U. Te
xas) as part of UCLA analysis and PDE seminar\n\n\nAbstract\nWe study a va
riational model for soap films based on capillarity theory and its relatio
n to minimal surfaces. Here\, soap films are modelled\, not as surfaces\,
but as regions of small volume satisfying a homotopic spanning condition.\
n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/47/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kasso Okoudjou (Tufts)
DTSTART;VALUE=DATE-TIME:20210309T220000Z
DTEND;VALUE=DATE-TIME:20210309T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/48
DESCRIPTION:Title: The HRT Conjecture\nby Kasso Okoudjou (Tufts) as part of
UCLA analysis and PDE seminar\n\n\nAbstract\nIn 1996\, C.~Heil\, J.~Ramana
tha\, and P.~Topiwala conjectured that the (finite) set $\\mathcal{G}(g\,
\\Lambda)=\\{e^{2\\pi i b_k \\cdot}g(\\cdot - a_k)\\}_{k=1}^N$ is linearly
independent for any non-zero square integrable function $g$ and subset
$\\Lambda=\\{(a_k\, b_k)\\}_{k=1}^N \\subset \\mathbb{R}^2.$ This problem
is now known as the HRT Conjecture\, and is still largely unresolved. \n
\n\nIn the first part of the talk\, I will give an overview of the state o
f the conjecture. I will then introduce an inductive approach to investiga
te the conjecture\, by attempting to answer the following question. Suppos
e the HRT conjecture is true for a function $g$ and a fixed set of $N$ poi
nts $\\Lambda=\\{(a_k\, b_k)\\}_{k=1}^N \\subset \\mathbb{R}^2.$ For what
other point $(a\, b)\\in \\mathbb{R}^2\\setminus \\Lambda$ will the HRT re
main true for the same function $g$ and the new set of $N+1$ points $\\Lam
bda'=\\Lambda \\cup \\{(a\, b)\\}$? I will illustrate this inductive argum
ent on special classes of sets $\\Lambda$ when $N\\leq 4$.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/48/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tuomas Hytonen (U. Helsinki)
DTSTART;VALUE=DATE-TIME:20210209T180000Z
DTEND;VALUE=DATE-TIME:20210209T190000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/49
DESCRIPTION:Title: Extrapolation of compactness on weighted spaces\nby Tuoma
s Hytonen (U. Helsinki) as part of UCLA analysis and PDE seminar\n\n\nAbst
ract\nThe extrapolation theorem of Rubio de Francia is one of the most pow
erful tools in the theory of weighted norm inequalities: it allows one to
deduce an inequality (often but not necessarily: the bounded of an operato
r) on all weighted L^p spaces with a range of p\, by checking it just for
one exponent p (but all relevant weights). My topic is an analogous method
for extrapolation of compactness. In a relatively soft way\, it recovers
several recent results about compactness of operators on weighted spaces a
nd also gives some new ones. I expect there to be many more applications t
o discover.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/49/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Kyeongsik Nam (UCLA)
DTSTART;VALUE=DATE-TIME:20210223T220000Z
DTEND;VALUE=DATE-TIME:20210223T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/50
DESCRIPTION:Title: Spectral large deviations for sparse random matrices\nby
Kyeongsik Nam (UCLA) as part of UCLA analysis and PDE seminar\n\n\nAbstrac
t\nThe large deviation problem for the spectrum of random matrices has att
racted immense interest. It was first studied for GUE and GOE\, which are
exactly solvable\, and subsequently studied for Wigner matrices with gener
al distributions. Once the sparsity is induced (i.e. each entry is multipl
ied by the independent Bernoulli distribution\, Ber(p))\, eigenvalues can
exhibit a drastically different behavior. For a large class of Wigner matr
ices\, including Gaussian ensembles and the adjacency matrix of Erdos-Reny
i graphs\, dense behavior ceases to hold near the constant average degree
of sparsity\, p~1/n (up to a poly-logarithmic factor). In this talk\, I wi
ll talk about the spectral large deviation for Gaussian ensembles with a s
parsity p=1/n. Joint work with Shirshendu Ganguly.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/50/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Nathan Keller (Bar Ilan University)
DTSTART;VALUE=DATE-TIME:20210420T170000Z
DTEND;VALUE=DATE-TIME:20210420T180000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/51
DESCRIPTION:Title: The mysteries of low-degree Boolean functions\nby Nathan
Keller (Bar Ilan University) as part of UCLA analysis and PDE seminar\n\n\
nAbstract\nAnalysis of Boolean functions studies functions on the discrete
cube {-1\,1}^n\, aiming at understanding what the structure of the (discr
ete) Fourier transform tells us about the function. In this talk we focus
on the structure of low-degree functions on the discrete cube\, namely\, o
n functions whose Fourier coefficients are concentrated on low degrees. Wh
ile such functions look very simple\, we are surprisingly far from underst
anding them well\, even in the most basic first-degree case. \nWe shall pr
esent several results on first-degree Boolean functions\, including the re
cent proof of Tomaszewski's conjecture (1986) which asserts that any first
-degree function (viewed as a random variable) lies within one standard de
viation from its expectation with probability at least 1/2. Then we shall
discuss several core open questions\, which boil down to understanding\, w
hat does the knowledge that a low-degree function is bounded\, or is two-v
alued\, tell us about its structure.\n\nBased on joint work with Ohad Klei
n\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/51/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ramon van Handel (Princeton)
DTSTART;VALUE=DATE-TIME:20210406T220000Z
DTEND;VALUE=DATE-TIME:20210406T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/52
DESCRIPTION:Title: The extremals of the Alexandrov-Fenchel inequality\nby Ra
mon van Handel (Princeton) as part of UCLA analysis and PDE seminar\n\n\nA
bstract\nIt is a basic fact of convexity that the volume of convex bodies
is a polynomial\, whose coefficients (mixed volumes) define a large family
of natural geometric parameters. A fundamental result of convex geometry\
, the Alexandrov-Fenchel inequality\, states that these coefficients are l
og-concave. This result proves to have striking connections with other are
as of mathematics\, such as combinatorics and algebraic geometry.\n\nThere
is a long-standing problem surrounding the Alexandrov-Fenchel inequality
that has remained open since the original works of Minkowski (1903) and Al
exandrov (1937): in what cases is equality attained? This question corresp
onds to the solution of certain unusual isoperimetric problems\, whose ext
remal bodies turn out to be numerous and strikingly bizarre. With Y. Shenf
eld\, we recently succeeded to settle this problem completely in the setti
ng of convex polytopes\, as well as to develop new tools for the study of
general convex bodies. In this talk\, I aim to sketch what the extremals l
ook like and to indicate some combinatorial\, analytic\, and geometric iss
ues that arise in their characterization.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/52/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Oleksiy Klurman (Bristol)
DTSTART;VALUE=DATE-TIME:20210420T180000Z
DTEND;VALUE=DATE-TIME:20210420T190000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/53
DESCRIPTION:Title: On the zeros of Fekete polynomials\nby Oleksiy Klurman (B
ristol) as part of UCLA analysis and PDE seminar\n\n\nAbstract\nSince its
discovery by Dirichlet in the nineteenth century\, Fekete polynomials (wit
h coefficients being Legendre symbols) and their zeros attracted considera
ble attention\, in particular\, due to their intimate connection with puta
tive Siegel zero and small class number problem.\n\nThe goal of this talk
is to discuss what we knew\, know and would like to know about zeros of su
ch (and\, time permitting\, related) polynomials.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/53/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pavel Zorin-Kranich (Bonn)
DTSTART;VALUE=DATE-TIME:20210427T170000Z
DTEND;VALUE=DATE-TIME:20210427T180000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/54
DESCRIPTION:Title: Decoupling for quadratic forms\nby Pavel Zorin-Kranich (B
onn) as part of UCLA analysis and PDE seminar\n\n\nAbstract\nI will talk a
bout how decoupling inequalities benefit from\nscale-dependent Brascamp-Li
eb inequalities. The main result describes\nthe sharp decoupling exponents
for all manifolds that can be represented\nas graphs of tuples of quadrat
ic forms. Joint work with Shaoming Guo\,\nChangkeun Oh\, and Ruixiang Zhan
g.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/54/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dorin Bucur (Université de Savoie)
DTSTART;VALUE=DATE-TIME:20210504T170000Z
DTEND;VALUE=DATE-TIME:20210504T180000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/55
DESCRIPTION:Title: Rigidity results for measurable sets\nby Dorin Bucur (Uni
versité de Savoie) as part of UCLA analysis and PDE seminar\n\n\nAbstract
\nLet $\\Omega \\subset \\R^d$ be a set with finite Lebesgue measure such
that\, for a fixed radius $r>0$\, the Lebesgue measure of $\\Omega \\cap
B _ r (x)$ is equal to a positive constant when $x$ varies in the essenti
al boundary of $\\Omega$. We prove that $\\Omega$ is a ball (or a finite
union of equal balls) provided it satisfies a nondegeneracy condition\,
which holds in particular for any set of diameter larger than $r$ which is
either open and connected\, or of finite perimeter and indecomposable. Th
is is a joint work with Ilaria Fragala.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/55/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stefanie Petermichl (University of Toulouse)
DTSTART;VALUE=DATE-TIME:20210504T180000Z
DTEND;VALUE=DATE-TIME:20210504T190000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/56
DESCRIPTION:Title: The matrix-weighted Hardy-Littlewood maximal function is unbo
unded\nby Stefanie Petermichl (University of Toulouse) as part of UCLA
analysis and PDE seminar\n\n\nAbstract\nIn a joint work with Nazarov\, Sk
reb and Treil\, we highlight a marked\ndifference in the presence of a mat
rix weight between the Doob type\nmaximal operator in the dyadic setting (
with absolute values outside)\nand the dyadic Hardy-Littlewood type maxima
l operator (with absolute\nvalues inside). The former is $L^2$ bounded whi
le the latter is not.\nFirst\, it will be discussed how to interpret these
operators in a\nspace with matrix weight. For this\, we will use convex b
odies to\nreplace absolute values. (equivalent to the more familiar\nChris
t-Goldberg type definition). We will also discuss the Carleson\nEmbedding
Theorems that are the natural partners of these maximal\noperators and obs
erve a different behaviour as well.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/56/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Izabella Laba (University of British Columbia)
DTSTART;VALUE=DATE-TIME:20210518T220000Z
DTEND;VALUE=DATE-TIME:20210518T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/57
DESCRIPTION:Title: Tiling the integers with translates of one tile: the Coven-Me
yerowitz tiling conditions for three prime factors\nby Izabella Laba (
University of British Columbia) as part of UCLA analysis and PDE seminar\n
\n\nAbstract\nIt is well known that if a finite set of integers A tiles th
e integers by translations\, then the translation set must be periodic\, s
o that the tiling is equivalent to a factorization A+B=Z_M of a finite cyc
lic group. Coven and Meyerowitz (1998) proved that when the tiling period
M has at most two distinct prime factors\, each of the sets A and B can be
replaced by a highly ordered "standard" tiling complement. It is not know
n whether this behaviour persists for all tilings with no restrictions on
the number of prime factors of M.\n\nIn joint work with Itay Londner\, we
proved that this is true when M=(pqr)^2 is odd. (We are currently finalizi
ng the even case.) In my talk I will discuss this problem and introduce th
e main ingredients in the proof.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/57/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Soeren Fournais (Aarhus University)
DTSTART;VALUE=DATE-TIME:20210518T230000Z
DTEND;VALUE=DATE-TIME:20210519T000000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/58
DESCRIPTION:Title: Energy of the Dilute Bose Gas in 3D\nby Soeren Fournais (
Aarhus University) as part of UCLA analysis and PDE seminar\n\n\nAbstract\
nIn this talk\, we will review recent progress on the energy of the 3 dime
nsional dilute Bose gas. It has recently become possible to verify the old
prediction by Bogoliubov and Lee-Huang-Yang of the first correction term
to the ground state energy of the interacting gas in the thermodynamic lim
it. \nIf time permits\, I will also discuss the relation of these energy r
esults to proofs of "Bose-Einstein condensation” on density dependent le
ngth scales.\n\nThis is joint work with Jan Philip Solovej.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/58/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Pablo Shmerkin (University of British Columbia)
DTSTART;VALUE=DATE-TIME:20210406T230000Z
DTEND;VALUE=DATE-TIME:20210407T000000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/59
DESCRIPTION:Title: Explicit and nonlinear variants of Bourgain's projection theo
rem\nby Pablo Shmerkin (University of British Columbia) as part of UCL
A analysis and PDE seminar\n\n\nAbstract\nBourgain's projection theorem is
a significant extension of his celebrated discretized sum-product theorem
. After reviewing the original formulation of the projection theorem\, I w
ill present an explicit version\, an extension to parametrized families of
smooth maps\, and applications to the Falconer distance set problem. Part
ly based on joint work in progress with Hong Wang.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/59/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Guofang Wei (UCSB)
DTSTART;VALUE=DATE-TIME:20210608T170000Z
DTEND;VALUE=DATE-TIME:20210608T180000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/61
DESCRIPTION:Title: Fundamental Gap Estimate for Convex Domains\nby Guofang W
ei (UCSB) as part of UCLA analysis and PDE seminar\n\n\nAbstract\nIn their
celebrated work\, B. Andrews and J. Clutterbuck proved the fundamental ga
p conjecture that difference of first two eigenvalues of the Laplacian wi
th Dirichlet boundary condition on convex domain with diameter D in the Eu
clidean space is greater than or equal to $3\\pi^2/D^2$. In several join
t works with X. Dai\, Z. He\, S. Seto\, L. Wang (in various subsets) th
e estimate is generalized\, showing the same lower bound holds for convex
domains in the unit sphere. In sharp contrast\, in recent joint work wit
h T. Bourni\, J. Clutterbuck\, X. Nguyen\, A. Stancu and V. Wheeler\, we
prove that the product of the fundamental gap with the square of the diame
ter can be arbitrarily small for convex domains of any diameter in hyper
bolic space. Very recently\, jointed with X. Nguyen\, A. Stancu\, we sho
w that even for horoconvex domains in the hyperbolic space\, the product
of their fundamental gap with the square of their diameter has no positive
lower bound.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/61/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tamar Ziegler (HUJI)
DTSTART;VALUE=DATE-TIME:20210608T180000Z
DTEND;VALUE=DATE-TIME:20210608T190000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/62
DESCRIPTION:Title: Some applications of analysis over finite fields\nby Tama
r Ziegler (HUJI) as part of UCLA analysis and PDE seminar\n\nLecture held
in https://caltech.zoom.us/j/99420414248.\n\nAbstract\nWe describe how one
can use equidistribution properties of families of polynomials defined ov
er finite fields to derive some interesting effective results in algebra.
For example : given an ideal J generated by m complex homogeneous polynomi
als of degree < d\, we show that J is contained in an ideal J’ generated
by C(m) homogeneous polynomials of degree < d that form a regular sequenc
e\, where C(m) is polynomial in m. All terms will be defined and explain
ed in the talk.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/62/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Julian Weigt (Aalto University)
DTSTART;VALUE=DATE-TIME:20210312T180000Z
DTEND;VALUE=DATE-TIME:20210312T190000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/63
DESCRIPTION:Title: Endpoint regularity of the dyadic and the fractional maximal
function\nby Julian Weigt (Aalto University) as part of UCLA analysis
and PDE seminar\n\n\nAbstract\nThe well-known open $W^{1\,1}$-problem for
maximal operators asks if the\nbound\n$\n\\|\\nabla Mf\\|_{L^1(\\mathbb R^
d)}\n\\leq C_d\n\\|\\nabla f\\|_{L^1(\\mathbb R^d)}\n$\nholds for the unce
ntered and the centered Hardy-Littlewood maximal\noperator.\nWe prove the
variants\n$\n\\mathop{\\mathrm{var}}(M^{\\mathrm d}f)\n\\leq C_d\n\\mathop
{\\mathrm{var}}(f)\n$\nfor the dyadic maximal operator $M^{\\mathrm d}$ an
d\n$\n\\|\\nabla M_\\alpha f\\|_{L^{d/(d-\\alpha)}(\\mathbb R^d)}\n\\leq C
_{d\,\\alpha}\n\\|\\nabla f\\|_{L^1(\\mathbb R^d)}\n$\nfor the uncentered
and the centered fractional Hardy-Littlewood maximal\noperator $M_\\alpha$
if $0<\\alpha \\lt d$.\n\nThe latter bound has thus far been known to hol
d only for\n$1\\leq\\alpha \\lt d$.\n\nThe techniques are rather elementar
y.\nThe proof for the the fractional Hardy-Littlewood maximal operator use
s\n$\\alpha>0$ to organize the optimal balls in a dyadic manner\nand then
reduce to the setting of dyadic cubes and apply the proof from\n$M^{\\math
rm d}$.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/63/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jeffrey Galkowski (University College London)
DTSTART;VALUE=DATE-TIME:20210511T170000Z
DTEND;VALUE=DATE-TIME:20210511T180000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/64
DESCRIPTION:Title: Geodesic beams and Weyl remainders\nby Jeffrey Galkowski
(University College London) as part of UCLA analysis and PDE seminar\n\n\n
Abstract\nIn this talk we discuss quantitative improvements for Weyl remai
nders\nunder dynamical assumptions on the geodesic flow. We consider a var
iety\nof Weyl type remainders including asymptotics for the eigenvalue\nco
unting function as well as for the on and off diagonal spectral\nprojector
. These improvements are obtained by combining the geodesic\nbeam approach
to understanding eigenfunction concentration together\nwith an appropriat
e decomposition of the spectral projector into\nquasimodes for the Laplaci
an. One striking consequence of these\nestimates is a quantitatively impro
ved Weyl remainder on all product\nmanifolds. This is joint work with Y.Ca
nzani\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/64/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Benjamin Harrop-Griffiths (UCLA)
DTSTART;VALUE=DATE-TIME:20210601T220000Z
DTEND;VALUE=DATE-TIME:20210601T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/65
DESCRIPTION:Title: Some recent progress on integrable PDEs\nby Benjamin Harr
op-Griffiths (UCLA) as part of UCLA analysis and PDE seminar\n\nLecture he
ld in https://ucla.zoom.us/j/9264073849.\n\nAbstract\nIn this talk we pres
ent some recent progress on integrable PDEs. We first consider the well-po
sedness of the cubic NLS and mKdV on the line. We then discuss results for
some related ODE and PDE models. This is joint work with Rowan Killip and
Monica Visan.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/65/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Terence Tao (UCLA)
DTSTART;VALUE=DATE-TIME:20210409T230000Z
DTEND;VALUE=DATE-TIME:20210410T000000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/66
DESCRIPTION:Title: Sendov's conjecture for sufficiently high degree polynomials<
/a>\nby Terence Tao (UCLA) as part of UCLA analysis and PDE seminar\n\n\nA
bstract\nIn 1958\, Blagovest Sendov made the following conjecture: if a po
lynomial $f$ of degree $n \\geq 2$ has all of its zeroes in the unit disk\
, and $a$ is one of these zeroes\, then at least one of the critical point
s of $f$ lies within a unit distance of $a$. Despite a large amount of ef
fort by many mathematicians and several partial results (such as the verif
ication of the conjecture for degrees $n \\leq 8$)\, the full conjecture r
emains unresolved. In this talk we present a new result that establishes
the conjecture whenever the degree $n$ is larger than some sufficiently la
rge absolute constant $n_0$. A result of this form was previously establi
shed in 2014 by Degot assuming that the distinguished zero $a$ stayed away
from the origin and the unit circle. To handle these latter cases we stu
dy the asymptotic limit as $n \\to \\infty$ using techniques from potentia
l theory (and in particular the theory of balayage)\, which has connection
s to probability theory (and Brownian motion in particular). Applying uni
que continuation theorems in the asymptotic limit\, one can control the as
ymptotic behavior of both the zeroes and the critical points\, which allow
s us to resolve the case when $a$ is near the origin via the argument prin
ciple\, and when $a$ is near the unit circle by careful use of Taylor expa
nsions to gain fine asymptotic control on the polynomial $f$.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/66/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shiri Artstein (Tel-Aviv University)
DTSTART;VALUE=DATE-TIME:20210525T170000Z
DTEND;VALUE=DATE-TIME:20210525T180000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/67
DESCRIPTION:Title: Transportation of measure with respect to non-traditional cos
t functions\nby Shiri Artstein (Tel-Aviv University) as part of UCLA a
nalysis and PDE seminar\n\nLecture held in https://ucla.zoom.us/j/92640738
49.\n\nAbstract\nWe will discuss some old and new transportation of measur
e results\, concentrating on the differences between the classical (quadra
tic\, and more generally – finite-valued) cost functions and the case of
so-called "non-traditional" costs\, when the cost considered is allowed t
o assume infinite values (that is\, some moves are prohibited).\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/67/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Shiri Artstein (Tel-Aviv University)
DTSTART;VALUE=DATE-TIME:20210520T180000Z
DTEND;VALUE=DATE-TIME:20210520T190000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/68
DESCRIPTION:Title: Polarity\, non-traditional measure transport\, and a new Rock
afellar-type theorem\nby Shiri Artstein (Tel-Aviv University) as part
of UCLA analysis and PDE seminar\n\nLecture held in Meeting ID: 973 5874 4
971\, Passcode: 015836.\n\nAbstract\nTransportation of measure is a classi
cal technique for proving many geometric and analytic results. The case wh
ere the cost considered is allowed to assume infinite values (that is\, so
me moves are prohibited) is less well studied. However\, the so-called “
polar-cost”\, which induces the polarity transform on geometric convex f
unction (a less-known-cousin of the Legendre transform) is such a cost. In
this talk we will discuss function classes and transforms induced by cost
s\, their associated cost-subgradients and optimal transportation. We will
discuss a new result\, characterizing plans which admit a “potential”
\, applicable to such “non-traditional” cost functions. If time permit
s\, we will also discuss an analogue of the Brenier/McCann theorem\, which
holds whenever two measures are strongly-compatible. All definitions and
notions will be explained throughout the talk\, as well as examples and in
tuition\, and no prior specialized knowledge in the theory of measure tran
sport is assumed.\n\nUCLA Distinguished Women in Math Lecture Series\n\nMe
eting ID: 973 5874 4971\, Passcode: 015836\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/68/
END:VEVENT
BEGIN:VEVENT
SUMMARY:John Garnett (UCLA)
DTSTART;VALUE=DATE-TIME:20211116T220000Z
DTEND;VALUE=DATE-TIME:20211116T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/69
DESCRIPTION:Title: Carleson measure estimates for bounded harmonic functions\,
without Ahlfors regularity assumptions.\nby John Garnett (UCLA) as pa
rt of UCLA analysis and PDE seminar\n\n\nAbstract\nLet $\\Omega$ be a doma
in in $R^{d+1}$ where $d \\geq 1$. It is known that (using definitions g
iven at the start of the talk) if $\\Omega$ satisfies a corkscrew conditi
on and $\\partial \\Omega$ is $d$-Ahlfors\, then the following are equiva
lent:\n\n(a) a square function Carleson measure estimate holds for all b
ounded harmonic functions on $\\Omega\;$\n\n(b) an $\\varepsilon$-approxim
ation property holds for all such functions and all $0 < \\varepsilon < 1\
;$\n\n(c) $\\partial \\Omega$ is uniformly rectifiable.\n\n Here we explor
e (a) and (b) when $\\partial \\Omega$ is not required to be Ahlfors regu
lar.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/69/
END:VEVENT
BEGIN:VEVENT
SUMMARY:William Feldman (University of Utah)
DTSTART;VALUE=DATE-TIME:20211012T210000Z
DTEND;VALUE=DATE-TIME:20211012T220000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/70
DESCRIPTION:Title: Limit shapes of Bernoulli-type free boundaries in periodic me
dia\nby William Feldman (University of Utah) as part of UCLA analysis
and PDE seminar\n\n\nAbstract\nI will discuss some simplified models for t
he shape of liquid droplets on rough solid surfaces\, especially Bernoulli
-type free boundary problems. In these models small scale roughness leads
to large scale non-uniqueness\, hysteresis\, and anisotropies. In techni
cal terms we need to understand laminating/foliating families of plane-lik
e solutions\, this is related to ideas of Aubry-Mather theory\, but\, unli
ke most results in that area\, we need to consider local (but not global)
energy minimizers.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/70/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ayla Gafni (University of Mississippi)
DTSTART;VALUE=DATE-TIME:20211019T210000Z
DTEND;VALUE=DATE-TIME:20211019T220000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/71
DESCRIPTION:Title: Uniform Distribution and Incidence Theory\nby Ayla Gafni
(University of Mississippi) as part of UCLA analysis and PDE seminar\n\n\n
Abstract\nThe Szemeredi-Trotter Incidence Theorem\, a central result in ge
ometric combinatorics\, bounds the number of incidences between n points a
nd m lines in the Euclidean plane. Replacing lines with circles leads to
the unit distance problem\, which asks how many pairs of points in a plana
r set of n points can be at a unit distance. The unit distance problem br
eaks down in dimensions 4 and higher due to degenerate configurations that
attain the trivial bound. However\, nontrivial results are possible unde
r certain structural assumptions about the point set. In this talk\, we w
ill introduce a quantitative version of uniform distribution and use that
property to obtain nontrivial bounds on unit distances and point-hyperplan
e incidences in higher-dimensional Euclidean space. This is based on join
t work with Alex Iosevich and Emmett Wyman.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/71/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Monica Visan (UCLA)
DTSTART;VALUE=DATE-TIME:20211026T210000Z
DTEND;VALUE=DATE-TIME:20211026T220000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/72
DESCRIPTION:Title: Orbital stability of KdV multisolitons in $H^{-1}$\nby Mo
nica Visan (UCLA) as part of UCLA analysis and PDE seminar\n\n\nAbstract\n
We introduce a variational characterization of multisoliton\nsolutions to
the Korteweg-de Vries equation that is meaningful in\n$H^{-1}$\, which is
the space of optimal well-posedness for this\nequation. As a consequence\
, we obtain orbital stability of\nmultisoliton solutions in $H^{-1}$. Thi
s is based on joint work with\nRowan Killip.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/72/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jarkko Kari (University of Turku)
DTSTART;VALUE=DATE-TIME:20211005T180000Z
DTEND;VALUE=DATE-TIME:20211005T190000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/73
DESCRIPTION:Title: Low complexity tilings of the plane\nby Jarkko Kari (Univ
ersity of Turku) as part of UCLA analysis and PDE seminar\n\n\nAbstract\nA
two-dimensional configuration is a coloring of the infinite grid Z^2 usin
g a finite number of colors. For a finite subset D of Z^2\, the D-patterns
of a configuration are the patterns of shape D that appear in the configu
ration. The number of distinct D-patterns of a configuration is a natural
measure of its complexity. We consider low-complexity configurations where
the number of distinct D-patterns is at most |D|\, the size of the shape.
We use algebraic tools to study periodicity of such configurations [1]. I
n the case D is a rectangle - or in fact any convex shape - we establish t
hat a uniformly recurrent configuration that has low-complexity with respe
ct to shape D must be periodic [2]. This implies an algorithm to determine
if a given collection of mn rectangular patterns of size mxn admit a conf
iguration containing only these patterns. Without the complexity bound the
question is the well-known undecidable domino problem. We also show\, for
an arbitrary shape D\, that a low-complexity configuration must be period
ic if it comes from the well-known Ledrappier subshift\, or from a wide fa
mily of other similar algebraic subshifts [3].\n\nReferences\n[1] J. Kari\
, M. Szabados. An Algebraic Geometric Approach to Nivat’s Conjecture. In
formation and Computation 271\, pp. 104481 (2020).\n[2] J. Kari\, E. Mouto
t. Decidability and Periodicity of Low Complexity Tilings. Theory of Compu
ting Systems (in Press).\n[3] J. Kari\, E. Moutot. Nivat’s conjecture an
d pattern complexity in algebraic subshifts. Theoretical Computer Science
777\, pp. 379–386 (2019).\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/73/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jared Speck (Vanderbilt Univeristy)
DTSTART;VALUE=DATE-TIME:20211130T180000Z
DTEND;VALUE=DATE-TIME:20211130T190000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/74
DESCRIPTION:Title: Advances in the mathematical theory of shock waves\nby Ja
red Speck (Vanderbilt Univeristy) as part of UCLA analysis and PDE seminar
\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/74/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yuming Paul Zhang (UCSD)
DTSTART;VALUE=DATE-TIME:20211102T220000Z
DTEND;VALUE=DATE-TIME:20211102T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/75
DESCRIPTION:Title: Optimal Estimates on the Propagation of Reactions with Fracti
onal Diffusion\nby Yuming Paul Zhang (UCSD) as part of UCLA analysis a
nd PDE seminar\n\n\nAbstract\nWe study the reaction-fractional-diffusion e
quation $u_t+(-\\Delta)^s u=f(u)$ with ignition and monostable reactions $
f$\, and $s\\in (0\,1)$. We obtain the first optimal bounds on the propaga
tion of front-like solutions in the cases where no traveling fronts exist.
Our results cover most of these cases\, and also apply to propagation fro
m localized initial data. This is a joint work with A. Zlatos.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/75/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Changkeun Oh (University of Wisconsin-Madison)
DTSTART;VALUE=DATE-TIME:20211123T220000Z
DTEND;VALUE=DATE-TIME:20211123T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/76
DESCRIPTION:Title: Decoupling inequalities for quadratic forms and beyond\nb
y Changkeun Oh (University of Wisconsin-Madison) as part of UCLA analysis
and PDE seminar\n\n\nAbstract\nIn this talk\, I will present some recent p
rogress on decoupling inequalities for some translation- and dilation-inva
riant systems (TDI systems in short). In particular\, I will emphasize dec
oupling inequalities for quadratic forms. If time permits\, I will also di
scuss some interesting phenomenon related to Brascamp-Lieb inequalities th
at appears in the study of a cubic TDI system. Joint work with Shaoming Gu
o\, Pavel Zorin-Kranich\, and Ruixiang Zhang.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/76/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ruoci Sun (Karlsruhe Institute of Technology)
DTSTART;VALUE=DATE-TIME:20211005T170000Z
DTEND;VALUE=DATE-TIME:20211005T180000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/77
DESCRIPTION:Title: Complete integrability of the Benjamin–Ono equation on the
multi-soliton manifolds\nby Ruoci Sun (Karlsruhe Institute of Technolo
gy) as part of UCLA analysis and PDE seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/77/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Luis Silvestre (University of Chicago)
DTSTART;VALUE=DATE-TIME:20211102T210000Z
DTEND;VALUE=DATE-TIME:20211102T220000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/78
DESCRIPTION:Title: Regularity estimates for the Boltzmann equation without cutof
f\nby Luis Silvestre (University of Chicago) as part of UCLA analysis
and PDE seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/78/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Or Shalom (HUJI)
DTSTART;VALUE=DATE-TIME:20211130T190000Z
DTEND;VALUE=DATE-TIME:20211130T200000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/79
DESCRIPTION:Title: A structure theorem for Gowers-Host-Kra seminorms for non-fin
itely generated countable abelian groups of unbounded torsion\nby Or S
halom (HUJI) as part of UCLA analysis and PDE seminar\n\n\nAbstract\nFurst
enberg's famous proof of Szemeredi's theorem leads to a natural question a
bout the convergence and limit of some multiple ergodic averages. In the c
ase of $\\mathbb{Z}$-actions these averages were studied by Host-Kra and Z
iegler. They show that the limiting behavior of such multiple ergodic aver
age is determined on a certain factor that can be given the structure of a
n inverse limit of nilsystems (i.e. rotations on a nilmanifold). This stru
cture result can be generalized to $\\mathbb{Z}^d$ actions (where the aver
age is taken over a Folner sequence)\, but the non-finitely generated case
is still open. The only progress prior to our work is due to Bergelson Ta
o and Ziegler\, who studied actions of the infinite direct sum $\\mathbb{Z
}/p\\mathbb{Z}$. In our work we generalize this further to the case where
the sum is taken over different primes (the most interesting case is when
the multiset of primes is unbounded). We will explain how this case is sig
nificantly different from the work of Bergelson Tao and Ziegler by describ
ing a new phenomenon that only happens in these settings. Moreover\, we wi
ll discuss a generalized version of nilsystems that plays a role in our wo
rk and some corollaries. If time allows we will also discuss the group act
ions of other abelian groups.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/79/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Tongou Yang (UBC)
DTSTART;VALUE=DATE-TIME:20211207T220000Z
DTEND;VALUE=DATE-TIME:20211207T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/80
DESCRIPTION:Title: Decoupling for smooth surfaces in $\\mathbb R^3$\nby Tong
ou Yang (UBC) as part of UCLA analysis and PDE seminar\n\n\nAbstract\nFor
each $d\\geq 0$\, we prove decoupling inequalities in $\\mathbb R\n^3$ for
the graphs of all bivariate polynomials of degree at most $d$ with\nbound
ed coefficients\, with the decoupling constant depending uniformly in d\nb
ut not the coefficients of each individual polynomial. As a consequence\,\
nwe prove a decoupling inequality for (a compact piece of) every smooth\ns
urface in $\\mathbb R^3$\, which in particular solves a conjecture of\nBou
rgain\, Demeter and Kemp.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/80/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Steve Shkoller (UC Davis)
DTSTART;VALUE=DATE-TIME:20211109T230000Z
DTEND;VALUE=DATE-TIME:20211110T000000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/81
DESCRIPTION:Title: Simultaneous development of shocks and cusps for 2D compressi
ble Euler from smooth initial data\nby Steve Shkoller (UC Davis) as pa
rt of UCLA analysis and PDE seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/81/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hyunju Kwon (IAS)
DTSTART;VALUE=DATE-TIME:20211019T220000Z
DTEND;VALUE=DATE-TIME:20211019T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/82
DESCRIPTION:Title: Euler flows with local energy dissipation\nby Hyunju Kwon
(IAS) as part of UCLA analysis and PDE seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/82/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alan Chang (Princeton)
DTSTART;VALUE=DATE-TIME:20211022T220000Z
DTEND;VALUE=DATE-TIME:20211022T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/83
DESCRIPTION:Title: The Kakeya needle problem for rectifiable sets\nby Alan C
hang (Princeton) as part of UCLA analysis and PDE seminar\n\n\nAbstract\nW
e show that the classical results about rotating a line segment in arbitra
rily small area\, and the existence of a Besicovitch and a Nikodym set hol
d if we replace the line segment by an arbitrary rectifiable set. This is
joint work with Marianna Csörnyei.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/83/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Laura Cladek (UCLA)
DTSTART;VALUE=DATE-TIME:20211109T220000Z
DTEND;VALUE=DATE-TIME:20211109T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/84
DESCRIPTION:Title: Additive energy of regular measures in one and higher dimensi
ons\, and the fractal uncertainty principle\nby Laura Cladek (UCLA) as
part of UCLA analysis and PDE seminar\n\n\nAbstract\nWe obtain new bounds
on the additive energy of (Ahlfors-David type) regular measures in both o
ne and higher dimensions\, which implies expansion results for sums and pr
oducts of the associated regular sets\, as well as more general nonlinear
functions of these sets. As a corollary of the higher-dimensional results
we obtain some new cases of the fractal uncertainty principle in odd dimen
sions. This is joint work with Terence Tao.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/84/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Annina Iseli
DTSTART;VALUE=DATE-TIME:20220104T220000Z
DTEND;VALUE=DATE-TIME:20220104T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/85
DESCRIPTION:Title: Projection theorems for linear-fractional families of project
ions\nby Annina Iseli as part of UCLA analysis and PDE seminar\n\n\nAb
stract\nMarstrand’s theorem (1954) states that given a Borel set A in th
e\nEuclidean plane\, the Hausdorff dimension of the image of A under the\n
orthogonal projection onto a line L equals the smaller of 1 and dimA\,\nfo
r almost every line L that contains the origin. This theorem has since\nbe
en generalized to higher dimensions as well as to various different\nspace
s that carry natural families of projection mappings.\nIn the first part o
f this talk\, I will recall some of these\ngeneralizations and the differe
nt methods used to proving them. In the\nsecond part\, I am going to prese
nt some recent (joint with A.\nLukyanenko) about projection theorems for f
amilies of projections that\nare induced by either Möbius transformations
or real linear fractional\ntransformations.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/85/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sarah Peluse (Princeton)
DTSTART;VALUE=DATE-TIME:20220111T230000Z
DTEND;VALUE=DATE-TIME:20220112T000000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/86
DESCRIPTION:Title: Polynomial and multidimensional configurations in dense sets<
/a>\nby Sarah Peluse (Princeton) as part of UCLA analysis and PDE seminar\
n\n\nAbstract\nSeveral of the most important problems in combinatorial num
ber theory ask for the size of the largest subset of an abelian group or i
nterval of integers lacking points in some 'arithmetic' configuration. One
example of such a question is\, "What is the largest subset of {1\,...\,N
} with no nontrivial k-term arithmetic progressions x\,x+y\,...\,x+(k-1)y?
". Gowers initiated the study of higher order Fourier analysis while seeki
ng to answer this question and used it to give the first reasonable quanti
tative bounds. In this talk\, I'll discuss what higher order Fourier analy
sis is and why it is relevant to the study of arithmetic progressions and
other configurations\, including 'polynomial' and 'multidimensional' confi
gurations\, and survey recent progress on problems related to the polynomi
al and multidimensional generalizations of Szemer\\'edi's theorem.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/86/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Marina Iliopoulou (University of Kent)
DTSTART;VALUE=DATE-TIME:20220111T220000Z
DTEND;VALUE=DATE-TIME:20220111T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/87
DESCRIPTION:Title: Sharp L^p estimates for oscillatory integral operators of arb
itrary signature\nby Marina Iliopoulou (University of Kent) as part of
UCLA analysis and PDE seminar\n\n\nAbstract\nThe restriction problem in h
armonic analysis asks for L^p bounds on the Fourier transform of functions
defined on curved surfaces. In this talk\, we will present restriction es
timates for hyperbolic paraboloids\, that depend on the signature of the p
araboloids. These estimates still hold\, and are sharp\, in the variable c
oefficient regime. This is joint work with Jonathan Hickman.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/87/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Malabika Pramanik (UBC)
DTSTART;VALUE=DATE-TIME:20220208T230000Z
DTEND;VALUE=DATE-TIME:20220209T000000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/88
DESCRIPTION:by Malabika Pramanik (UBC) as part of UCLA analysis and PDE se
minar\n\nInteractive livestream: https://usc.zoom.us/j/96145515329?pwd=d2h
aQkIwZFNVRlRJK3BjbEhMQVh1Zz09\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/88/
URL:https://usc.zoom.us/j/96145515329?pwd=d2haQkIwZFNVRlRJK3BjbEhMQVh1Zz09
END:VEVENT
BEGIN:VEVENT
SUMMARY:Joshua Zahl (UBC)
DTSTART;VALUE=DATE-TIME:20220301T220000Z
DTEND;VALUE=DATE-TIME:20220301T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/89
DESCRIPTION:by Joshua Zahl (UBC) as part of UCLA analysis and PDE seminar\
n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/89/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Stan Palasek (UCLA)
DTSTART;VALUE=DATE-TIME:20220222T220000Z
DTEND;VALUE=DATE-TIME:20220222T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/90
DESCRIPTION:by Stan Palasek (UCLA) as part of UCLA analysis and PDE semina
r\n\nInteractive livestream: https://ucla.zoom.us/j/94664076456?pwd=cmxmcX
QwSmMzSlRIUkMzUXE0RWlWQT09\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/90/
URL:https://ucla.zoom.us/j/94664076456?pwd=cmxmcXQwSmMzSlRIUkMzUXE0RWlWQT0
9
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cristina Pereyra (UNM)
DTSTART;VALUE=DATE-TIME:20220308T220000Z
DTEND;VALUE=DATE-TIME:20220308T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/91
DESCRIPTION:by Cristina Pereyra (UNM) as part of UCLA analysis and PDE sem
inar\n\nInteractive livestream: https://ucla.zoom.us/j/94664076456?pwd=cmx
mcXQwSmMzSlRIUkMzUXE0RWlWQT09\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/91/
URL:https://ucla.zoom.us/j/94664076456?pwd=cmxmcXQwSmMzSlRIUkMzUXE0RWlWQT0
9
END:VEVENT
BEGIN:VEVENT
SUMMARY:Friedrich Klaus (KIT)
DTSTART;VALUE=DATE-TIME:20220125T180000Z
DTEND;VALUE=DATE-TIME:20220125T190000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/92
DESCRIPTION:Title: Well-posedness for the KdV hierarchy\nby Friedrich Klaus
(KIT) as part of UCLA analysis and PDE seminar\n\n\nAbstract\nWe show well
-posedness for the KdV hierarchy at H^{-1} regularity and for the Gardner
hierarchy at L^2 regularity\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/92/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Young-heon Kim (UBC)
DTSTART;VALUE=DATE-TIME:20220315T210000Z
DTEND;VALUE=DATE-TIME:20220315T220000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/93
DESCRIPTION:by Young-heon Kim (UBC) as part of UCLA analysis and PDE semin
ar\n\nInteractive livestream: https://ucla.zoom.us/j/94664076456?pwd=cmxmc
XQwSmMzSlRIUkMzUXE0RWlWQT09\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/93/
URL:https://ucla.zoom.us/j/94664076456?pwd=cmxmcXQwSmMzSlRIUkMzUXE0RWlWQT0
9
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michael Hochman (HUJI)
DTSTART;VALUE=DATE-TIME:20220125T170000Z
DTEND;VALUE=DATE-TIME:20220125T180000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/94
DESCRIPTION:Title: Host-type equidistribution results\nby Michael Hochman (H
UJI) as part of UCLA analysis and PDE seminar\n\n\nAbstract\nGive two some
what hyperbolic maps f\,g of a manifold\, fix an invariant probability mea
sure mu for f\, and act on mu\, or on mu-typical points\, by g. Assuming
the maps f\,g are not too closely related\, one expects the orbit to equid
istribute for some natural measure. Examples of this kind begin with Casse
l's and Schmidts theorems on normality of numbers in the ternary Cantor se
t\, and more recently in Host's theorem about measures on tori invariant u
nder endomoirphisms. In the talk\, I will discuss some new results of this
type which extend Host's theorem to its natural generality. The main focu
s will be on the method of proof\, which relies on soft ideas from equidis
tribution theory\, fractal geometry and harmonic analysis\, and some basic
linear algebra.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/94/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Dallas Albritton (IAS)
DTSTART;VALUE=DATE-TIME:20220222T230000Z
DTEND;VALUE=DATE-TIME:20220223T000000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/95
DESCRIPTION:by Dallas Albritton (IAS) as part of UCLA analysis and PDE sem
inar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/95/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Maria Colombo (EPFL)
DTSTART;VALUE=DATE-TIME:20220118T190000Z
DTEND;VALUE=DATE-TIME:20220118T200000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/96
DESCRIPTION:Title: Nonuniqueness results from 2D Euler equations to 3D Navier-St
okes equations\nby Maria Colombo (EPFL) as part of UCLA analysis and P
DE seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/96/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yu Deng (USC)
DTSTART;VALUE=DATE-TIME:20220118T180000Z
DTEND;VALUE=DATE-TIME:20220118T190000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/97
DESCRIPTION:Title: Mathematical wave turbulence and propagation of chaos\nby
Yu Deng (USC) as part of UCLA analysis and PDE seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/97/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mihaela Ifrim (University of Wisconsin)
DTSTART;VALUE=DATE-TIME:20220208T220000Z
DTEND;VALUE=DATE-TIME:20220208T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/98
DESCRIPTION:by Mihaela Ifrim (University of Wisconsin) as part of UCLA ana
lysis and PDE seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/98/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Frederick Manners (UCSD)
DTSTART;VALUE=DATE-TIME:20220201T233000Z
DTEND;VALUE=DATE-TIME:20220202T003000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/99
DESCRIPTION:Title: Iterated Cauchy--Schwarz arguments and true complexity\nb
y Frederick Manners (UCSD) as part of UCLA analysis and PDE seminar\n\nInt
eractive livestream: https://caltech.zoom.us/j/84888011443\n\nAbstract\nTh
is talk is about useful facts that can be proved by repeated application o
f the Cauchy--Schwarz inequality. For example\, it is standard that expre
ssions $\\sum_{x\,y} f(x\,y) a(x) b(y)$ are controlled by the matrix norm
$\\sum_{x\,y\,x'\,y'} f(x\,y) f(x\,y') f(x'\,y) f(x'\,y')$\, and an elemen
tary proof is by applying Cauchy--Schwarz twice. Similarly in additive co
mbinatorics\, counting three-term arithmetic progressions (x\,x+y\,x+2y) (
i.e.\, averages $\\sum_{x\,y} f_1(x) f_2(x+y) f_3(x+2y)$) is controlled by
the Gowers $U^2$-norm $\\sum_{x\,y\,x'\,y'} f(x+y) f(x+y') f(x'+y) f(x'+y
')$: generalizations of this are the starting point of Gowers' proof of Sz
emeredi's theorem.\n\nHowever\, seemingly simple generalizations of this s
tatement quickly become subtle. For example\, linear configurations $(x\,
x+z\, x+y\, x+y+z\, x+2y+3z\, 2x+3y+6z)$ are controlled by the $U^2$-norm
(and so by Fourier analysis) but it is not at all straightforward to prov
e this just with Cauchy--Schwarz\; whereas controlling $(x\, x+z\, x+y\, x
+y+z\, x+2y+3z\, 13x+12y+9z)$ requires the $U^3$-norm (i.e.\, quadratic Fo
urier analysis) and this can be proved just with Cauchy--Schwarz. A conje
cture of Gowers and Wolf (resolved by the joint efforts of various authors
) gives a condition to determine when a configuration is controlled by the
$U^k$-norm\, but the proofs require deep structure theorems and (unlike C
auchy--Schwarz arguments) give very weak bounds.\n\nIn this talk\, I will
describe how it is (sometimes) possible to find the missing Cauchy--Schwar
z arguments by "mining proofs". The equality cases of these Cauchy--Schwa
rz inequalities correspond (it turns out) to facts about functional equati
ons. For example\, the 3-term progression case states the following: if $
f_1\,f_2\,f_3$ are functions such that $f_1(x)+f_2(x+h)+f_3(x+2h) = 0$ for
all $x\,h$\, then each $f_i$ must be affine-linear. This statement is no
t completely obvious but has a short elementary proof.\n\nGiven such an el
ementary proof\, sometimes we can reverse the process to find an iterated
Cauchy--Schwarz proof of the corresponding inequality -- albeit a very lon
g and complicated one that would be hard to discover by hand\, and requiri
ng a proof of a very specific type. This answers the Gowers--Wolf questio
n with polynomial bounds\, and hopefully other questions where the availab
ility of complicated Cauchy--Schwarz arguments is a limiting factor.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/99/
URL:https://caltech.zoom.us/j/84888011443
END:VEVENT
BEGIN:VEVENT
SUMMARY:Zane Li (IU)
DTSTART;VALUE=DATE-TIME:20220215T220000Z
DTEND;VALUE=DATE-TIME:20220215T230000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/100
DESCRIPTION:by Zane Li (IU) as part of UCLA analysis and PDE seminar\n\nAb
stract: TBA\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/100/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sung-Jin Oh (UC Berkeley)
DTSTART;VALUE=DATE-TIME:20220301T230000Z
DTEND;VALUE=DATE-TIME:20220302T000000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/101
DESCRIPTION:by Sung-Jin Oh (UC Berkeley) as part of UCLA analysis and PDE
seminar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/101/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sohrab Shahshahani (UMass\, Amherst)
DTSTART;VALUE=DATE-TIME:20220201T223000Z
DTEND;VALUE=DATE-TIME:20220201T233000Z
DTSTAMP;VALUE=DATE-TIME:20220128T014400Z
UID:UCLAAnalysisSeminar/102
DESCRIPTION:Title: Tidal energy in Newtonian two-body motion\nby Sohrab Sha
hshahani (UMass\, Amherst) as part of UCLA analysis and PDE seminar\n\nInt
eractive livestream: https://caltech.zoom.us/j/84888011443\n\nAbstract\nIn
this talk we discuss the tidal energy for the motion of two\n gravitating
incompressible fluid balls with free boundaries\, obeying the\n Euler-Poi
sson equations. When the fluids are replaced by point\n masses\, the conic
curve describing the trajectories of the bodies are\n known according to
the classical analysis of Newton. We will consider the\n effect of replaci
ng point masses by fluid balls in this analysis. This is\n joint work with
Shuang Miao from Wuhan University.\n
LOCATION:https://researchseminars.org/talk/UCLAAnalysisSeminar/102/
URL:https://caltech.zoom.us/j/84888011443
END:VEVENT
END:VCALENDAR