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BEGIN:VEVENT
SUMMARY:Phil Saad (Stanford)
DTSTART;VALUE=DATE-TIME:20200622T180000Z
DTEND;VALUE=DATE-TIME:20200622T190000Z
DTSTAMP;VALUE=DATE-TIME:20201029T100959Z
UID:UKYhepth/1
DESCRIPTION:Title: Some comments about wormholes and factorization\nby Phi
l Saad (Stanford) as part of Theoretical Physics Seminars (Kentucky)\n\nAb
stract: TBA\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Robert Brandenberger (McGill University)
DTSTART;VALUE=DATE-TIME:20200824T180000Z
DTEND;VALUE=DATE-TIME:20200824T190000Z
DTSTAMP;VALUE=DATE-TIME:20201029T100959Z
UID:UKYhepth/2
DESCRIPTION:Title: Inflation and Alternative Early Universe Scenarios in L
ight of the Swampland Constraints\nby Robert Brandenberger (McGill Univers
ity) as part of Theoretical Physics Seminars (Kentucky)\n\nAbstract: TBA\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Igor Klebanov (Princeton U.)
DTSTART;VALUE=DATE-TIME:20200831T180000Z
DTEND;VALUE=DATE-TIME:20200831T190000Z
DTSTAMP;VALUE=DATE-TIME:20201029T100959Z
UID:UKYhepth/3
DESCRIPTION:Title: Breaking of Discrete and Continuous Symmetries in Coupl
ed SYK or Tensor Models\nby Igor Klebanov (Princeton U.) as part of Theore
tical Physics Seminars (Kentucky)\n\n\nAbstract\nAbstract : \n\nA large nu
mber of Majorana fermions with interactions coupling four of them at a tim
e can exhibit interesting quantum dynamics. Models of this kind include th
e Sachdev-Ye-Kitaev (SYK) model\, where the coefficients of quartic intera
ctions are randomly distributed\, and the Tensor models\, where they respe
ct continuous symmetries. These models exhibit approximate invariance unde
r scaling of the time and have power law fall-off of the correlation funct
ions.\n\nIn this talk we will discuss a pair of SYK or Tensor models coupl
ed by the quartic interactions\, and show that they produce a richer set o
f phenomena. These include a line of fixed points\, where critical exponen
ts vary along the line and formally acquire imaginary parts outside it. Fo
r one sign of the coupling constant\, the approximate scale invariance con
tinues to hold. For the other\, a gap opens in the energy spectrum\, resul
ting in exponential fall-off of correlation functions. This is indicative
of breaking of a discrete symmetry. Thus\, our quantum mechanical model ex
hibits dynamical phenomena characteristic of higher dimensional quantum fi
eld theories. Furthermore\, the gapped phase of our model may be dual to a
certain traversable wormhole in two-dimensional space-time.\n\nThe talk w
ill end with a similar discussion of a pair of complex SYK models coupled
by a quartic interaction which preserves the U(1) x U(1) symmetry. For a r
ange of parameters\, this model gives rise to breaking of one of the U(1)
symmetries. This is demonstrated via an analysis of the large N Dyson-Schw
inger equations\, as well as by Exact Diagonalizations of the finite N Ham
iltonians.\n\nZoom: https://uky.zoom.us/j/97553578130\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Diptarka Das (IIT Kanpur)
DTSTART;VALUE=DATE-TIME:20200909T160000Z
DTEND;VALUE=DATE-TIME:20200909T170000Z
DTSTAMP;VALUE=DATE-TIME:20201029T100959Z
UID:UKYhepth/4
DESCRIPTION:Title: Virasoro blocks and quasimodular forms\nby Diptarka Das
(IIT Kanpur) as part of Theoretical Physics Seminars (Kentucky)\n\n\nAbst
ract\nWe analyse Virasoro blocks as an expansion in heavy exchange dimensi
on. For the one point torus block and the four point sphere block each ord
er in the expansion can be written as polynomials in the Eisenstein series
. These polynomials are further constrained to satisfy a recursion relatio
n\, which can be re-expressed as a noiseless KPZ equation for the blocks.
This structure can be utilized along with the Zamolodchikov recursions to
develop an algorithm to construct blocks in the heavy regime. We apply our
results to find the corrections to averaged heavy-heavy-light OPE coeffic
ients.\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Partha Mukhopadhyay (Matscience)
DTSTART;VALUE=DATE-TIME:20200916T160000Z
DTEND;VALUE=DATE-TIME:20200916T170000Z
DTSTAMP;VALUE=DATE-TIME:20201029T100959Z
UID:UKYhepth/5
DESCRIPTION:Title: A Covariant Lattice and its Application to String Bits\
nby Partha Mukhopadhyay (Matscience) as part of Theoretical Physics Semina
rs (Kentucky)\n\n\nAbstract\nWe explore a possibility of constructing latt
ice theories from a basic principle where lattice is viewed as a restricti
on of the continuum. This allows us to derive a discrete derivative\, nonl
ocal on the lattice\, that satisfies Liebniz rule. As a result a theorem r
elated to locality follows which states that any local equation in the cla
ssical continuum theory holds true also locally on the lattice. Using this
one is able to preserve a remnant of all the global and gauge symmetries\
, which\, in two dimensions\, can be lifted to include local diffeomorphis
m and Weyl symmetries as well. Consequently\, one is able\, for example\,
to carry out classical BRST construction of covariant sting bits (for the
first time).\n\nThis lattice derivative is\, in some sense\, similar to SL
AC derivative discussed earlier in the literature. However\, we point out
that its action suffers from branch cut ambiguities while acting on Fourie
r basis. This may indicate that quantization is not straightforward and ma
y have to be done entirely in position space.\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alexander Maloney (McGill University)
DTSTART;VALUE=DATE-TIME:20200928T180000Z
DTEND;VALUE=DATE-TIME:20200928T190000Z
DTSTAMP;VALUE=DATE-TIME:20201029T100959Z
UID:UKYhepth/6
DESCRIPTION:Title: Gravity from Averaging CFTs\nby Alexander Maloney (McGi
ll University) as part of Theoretical Physics Seminars (Kentucky)\n\n\nAbs
tract\nI will explore the idea that certain theories of gravity in Anti-de
\nSitter space are dual to an average over an ensemble of quantum\ntheorie
s\, rather than to a specific quantum theory. I will describe\nan average
over Narainâ€™s family of two-dimensional conformal field\ntheories which
describe free bosons on a torus\, and compute the\npartition function usi
ng the Siegel-Weil formula. The result takes\nthe form of a sum over geom
etries as one would expect in a theory of\ngravity. But the gravitational
theory looks more like a Chern-Simons\ntheory than like Einstein gravity.
\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Sabrina Pasterski (Princeton University)
DTSTART;VALUE=DATE-TIME:20200930T163000Z
DTEND;VALUE=DATE-TIME:20200930T173000Z
DTSTAMP;VALUE=DATE-TIME:20201029T100959Z
UID:UKYhepth/7
DESCRIPTION:Title: Asymptotic Symmetries & Celestial CFT\nby Sabrina Paste
rski (Princeton University) as part of Theoretical Physics Seminars (Kentu
cky)\n\n\nAbstract\nA universal relationship between asymptotic symmetries
\, QFT soft theorems\, and low energy observables has reinvigorated attemp
ts at flat space holography. In this talk we introduce a map from 4d S-ma
trix elements to 2d correlators in the putative dual Celestial CFT. In pa
rticular\, we will focus on recent progress towards understanding elements
of the IR triangle from the perspective of our Celestial CFT.\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Petr Horava (Berkeley)
DTSTART;VALUE=DATE-TIME:20201005T180000Z
DTEND;VALUE=DATE-TIME:20201005T190000Z
DTSTAMP;VALUE=DATE-TIME:20201029T100959Z
UID:UKYhepth/8
DESCRIPTION:Title: Large N Expansion and Strings Out of Equilibrium\nby Pe
tr Horava (Berkeley) as part of Theoretical Physics Seminars (Kentucky)\n\
n\nAbstract\nWe use the methods of large N expansion in non-equilibrium ma
ny-body systems with matrix degrees of freedom\, to identify some universa
l features of the anticipated dual description in terms of non-equilibrium
string perturbation theory. We find that string worldsheets exhibit a tr
iple decomposition\, associated with the forward and backward branches of
the Schwinger-Keldysh time contour\, and with the point at the "end of tim
e" where the two branches meet.\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Natalie Klco (U. Washington)
DTSTART;VALUE=DATE-TIME:20201012T180000Z
DTEND;VALUE=DATE-TIME:20201012T190000Z
DTSTAMP;VALUE=DATE-TIME:20201029T100959Z
UID:UKYhepth/9
DESCRIPTION:Title: Calculating Nature Naturally\nby Natalie Klco (U. Washi
ngton) as part of Theoretical Physics Seminars (Kentucky)\n\n\nAbstract\nS
tudying nature directly from fundamental degrees of freedom is often compu
tationally limited by \nphysical characteristics of exponentially growing
configuration (Hilbert) spaces with particle number \nand signal-to-noise
problems. This leaves many systems of interest to nuclear and particle phy
sics \nintractable for known algorithms with current and foreseeable class
ical computational resources. By \nleveraging their natural capacity to de
scribe entangled many-body states\, the use of quantum systems \nthemselve
s to form a computational framework is envisioned to be advantageous. In
this talk\, I will \nshare a developing perspective on the entanglement st
ructure of quantum fields and discuss implications \nfor their efficient s
imulation on quantum computational architectures.\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ying Zhao (IAS)
DTSTART;VALUE=DATE-TIME:20201014T160000Z
DTEND;VALUE=DATE-TIME:20201014T170000Z
DTSTAMP;VALUE=DATE-TIME:20201029T100959Z
UID:UKYhepth/10
DESCRIPTION:Title: The complexity of Petz map\nby Ying Zhao (IAS) as part
of Theoretical Physics Seminars (Kentucky)\n\nAbstract: TBA\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yoshitaka Hatta
DTSTART;VALUE=DATE-TIME:20201019T180000Z
DTEND;VALUE=DATE-TIME:20201019T190000Z
DTSTAMP;VALUE=DATE-TIME:20201029T100959Z
UID:UKYhepth/11
DESCRIPTION:Title: QCD trace anomaly and the proton mass problem\nby Yoshi
taka Hatta as part of Theoretical Physics Seminars (Kentucky)\n\n\nAbstrac
t\nThe trace anomaly of QCD is fundamentally important as it imparts mass
to hadrons and nuclei\, hence to the visible universe. In this talk\, I wi
ll introduce two recent developments regarding the anomaly. In the first p
art\, I discuss the decomposition of the trace anomaly into the quark and
gluon parts. This is a well-defined field theoretical problem that can be
addressed in perturbation theory. In the second part\, I will explain how
to measure the gluon condensate $\\lange P|F^{\\mu\\nu}F_{\\mu\\nu}|P\\ran
gle$\, which constitutes the major part of the trace anomaly\, in near-thr
eshold $J/\\psi$ production in electron-proton scattering. After giving a
review of the existing theoretical approaches and the experimental situati
on\, I will explain our new approaches to both photo-production and lepto-
production.\n\nPlease email allicsiva@uky.edu for zoom info if interested
in attending\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Lampros Lamprou (MIT)
DTSTART;VALUE=DATE-TIME:20201021T160000Z
DTEND;VALUE=DATE-TIME:20201021T170000Z
DTSTAMP;VALUE=DATE-TIME:20201029T100959Z
UID:UKYhepth/12
DESCRIPTION:Title: Inside the Hologram: The bulk observer's experience\nby
Lampros Lamprou (MIT) as part of Theoretical Physics Seminars (Kentucky)\
n\n\nAbstract\nI will present a holographic framework for reconstructing t
he experience of bulk observers in AdS/CFT. In particular\, I will show ho
w to recover the proper time and energy distribution measured along bulk w
orldlines\, directly in the CFT via a universal\, background-independent p
rescription. For an observer falling into an eternal AdS black hole\, the
proposal resolves a conceptual puzzle raised by Marolf and Wall. Notably\,
the prescription does not rely on an external dynamical Hamiltonian or th
e AdS boundary conditions and is\, therefore\, outlining a general framewo
rk for the emergence of time.\n\nPlease email allicsiva@uky.edu for zoom i
nfo if interested in attending\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Michal P. Heller (Max Planck Institute for Gravitational Physics)
DTSTART;VALUE=DATE-TIME:20201026T180000Z
DTEND;VALUE=DATE-TIME:20201026T190000Z
DTSTAMP;VALUE=DATE-TIME:20201029T100959Z
UID:UKYhepth/13
DESCRIPTION:Title: Complexity and Conformal Field Theory\nby Michal P. Hel
ler (Max Planck Institute for Gravitational Physics) as part of Theoretica
l Physics Seminars (Kentucky)\n\n\nAbstract\nViewing fundamental physics p
rocesses through the lenses of quantum information storage and processing
is a new frontier in gravity and quantum field theory. Much of what we hav
e learnt in the past decade builds on the notion of entanglement and its e
ntropy. The latter quantifies how hard it is to store a quantum-many body
state of interest on a classical computer. Complexity is a new player in t
he high-energy physics context and quantifies how hard it is to prepare a
quantum-many body state using limited resources. Learning from the success
story of entanglement entropy\, establishing universal results on complex
ity in two-dimensional conformal field theories should open many new resea
rch directions\, including finding a precise gravity dual. I will discuss
recent progress on this problem reported in 2005.02415 and 2007.11555 with
Flory.\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Emil Martinec (University of Chicago)
DTSTART;VALUE=DATE-TIME:20201028T160000Z
DTEND;VALUE=DATE-TIME:20201028T170000Z
DTSTAMP;VALUE=DATE-TIME:20201029T100959Z
UID:UKYhepth/14
DESCRIPTION:Title: The Return of the String\nby Emil Martinec (University
of Chicago) as part of Theoretical Physics Seminars (Kentucky)\n\n\nAbstra
ct\nTwo applications of worldsheet string theory illustrate the structure
of string theory near the threshold of black hole formation. In the first
\, we consider string probes of horizonless microstate geometries and find
that strong tidal forces cause infalling strings to become trapped\, mimi
cking the absorptive properties of black holes. In the second\, we re-exa
mine the structure of (near) BPS microstates and find a mechanism whereby
the geometrical description breaks down.\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mark Van Raamsdonk (UBC)
DTSTART;VALUE=DATE-TIME:20201102T190000Z
DTEND;VALUE=DATE-TIME:20201102T200000Z
DTSTAMP;VALUE=DATE-TIME:20201029T100959Z
UID:UKYhepth/15
DESCRIPTION:Title: Towards Microscopic Models of Big Bang Cosmology\nby Ma
rk Van Raamsdonk (UBC) as part of Theoretical Physics Seminars (Kentucky)\
n\n\nAbstract\nIn this talk\, we review an approach to describing cosmolog
ical\nphysics using ordinary AdS/CFT\, where the cosmological physics is t
he\neffective description of an end-of-the-world brane which cuts off the\
nsecond asymptotic region of a two-sided black hole. The worldvolume\ngeom
etry of the brane is an FRW big-bang/big-crunch spacetime. In\nfavorable c
ircumstances\, the brane acts as a Randall-Sundrum Planck\nbrane so that g
ravity localizes. We describe a microscopic construction\nfor such an end-
of-the-world brane with localized gravity in AdS/CFT\,\nstarting from N=4
SYM theory. We suggest specific microscopic states of\nN=4 SYM theory that
may encode the physics in a four-dimensional\ncosmological spacetime.\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Vishnu Jejjala
DTSTART;VALUE=DATE-TIME:20201104T170000Z
DTEND;VALUE=DATE-TIME:20201104T180000Z
DTSTAMP;VALUE=DATE-TIME:20201029T100959Z
UID:UKYhepth/16
DESCRIPTION:Title: Machine learning as a discovery tool in hep-th\nby Vish
nu Jejjala as part of Theoretical Physics Seminars (Kentucky)\n\n\nAbstrac
t\nMachine learning provides a new tool for analyzing Big Data and Small D
ata in mathematics and theoretical physics. In this talk\, I discuss two c
ase studies. The first predicts the volume of the knot complement of hyper
bolic knots from the Jones polynomial. The second predicts the masses of b
aryons such as the proton and neutron from knowledge only of the meson spe
ctrum and distinguishes between different composition hypotheses for exoti
c QCD resonances. Both investigations point to the existence of new analyt
ic formulae.\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Al Shapere (Kentucky)
DTSTART;VALUE=DATE-TIME:20201109T190000Z
DTEND;VALUE=DATE-TIME:20201109T200000Z
DTSTAMP;VALUE=DATE-TIME:20201029T100959Z
UID:UKYhepth/17
DESCRIPTION:by Al Shapere (Kentucky) as part of Theoretical Physics Semina
rs (Kentucky)\n\nAbstract: TBA\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Raul Briceno (JLab)
DTSTART;VALUE=DATE-TIME:20201111T170000Z
DTEND;VALUE=DATE-TIME:20201111T180000Z
DTSTAMP;VALUE=DATE-TIME:20201029T100959Z
UID:UKYhepth/19
DESCRIPTION:Title: Long Range Processes in QCD\nby Raul Briceno (JLab) as
part of Theoretical Physics Seminars (Kentucky)\n\n\nAbstract\nA rich vari
ety of phenomena in the Standard Model and its extensions manifest in long
-range processes involving bound states of quantum chromodynamics (QCD)\,
namely hadrons. These are processes where intermediate hadronic states pro
pagate over a long distance\, between electroweak interactions. Examples i
nclude virtual Compton scattering and double-beta decay. Such processes ar
e at the cusp of what can be systematically studied given two challenges.
First\, these reactions involve hadrons\, and as a result one must use a n
on-perturbative tool to access their amplitudes. Currently lattice QCD is
the only systematically improvable way we have for doing just this. Second
\, lattice QCD is defined in a finite\, Euclidean spacetime. This introduc
es its own specific challenges\, time in purely imaginary in lattice QCD\,
and by truncating the space one looses the notion of asymptotic states. I
n this talk I explain how these issues can all be resolved systematically
for a relatively large kinematic region. In presenting the necessary forma
lism for doing this\, I will summarize recent progress in lattice QCD in o
rder to argue that the community is up to the challenge.\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Thomas Barthel (Duke)
DTSTART;VALUE=DATE-TIME:20201116T190000Z
DTEND;VALUE=DATE-TIME:20201116T200000Z
DTSTAMP;VALUE=DATE-TIME:20201029T100959Z
UID:UKYhepth/20
DESCRIPTION:Title: Entanglement entropy of energy eigenstates follows a un
iversal scaling function\nby Thomas Barthel (Duke) as part of Theoretical
Physics Seminars (Kentucky)\n\n\nAbstract\nWe consider the entanglement en
tropies of energy eigenstates in quantum many-\nbody systems. For the typi
cal models that allow for a field-theoretical\ndescription of the long-ran
ge physics\, we find that the entanglement entropy of\n(almost) all eigens
tates is described by a single scaling function. This is\npredicated on th
e validity of the weak or strong eigenstate thermalization\nhypothesis (ET
H)\, which then implies that the scaling functions can be deduced\nfrom su
bsystem entropies of thermal ensembles. The scaling functions describe\nth
e full crossover from the groundstate entanglement regime for low energies
\nand small subsystem size (area or log-area law) to the extensive volume-
law\nregime for high energies or large subsystem size. For critical 1d sys
tems\, the\nscaling function follows from conformal field theory (CFT). We
use it to also\ndeduce the scaling function for Fermi liquids in d>1 dime
nsions. These\nanalytical results are complemented by numerics for large n
on-interacting\nsystems of fermions in d=1\,2\,3 and the harmonic lattice
model in d=1\,2.\nLastly\, we demonstrate ETH for entanglement entropies a
nd the validity of the\nscaling arguments in integrable and non-integrable
interacting spin chains. In\nparticular\, we analyze the XXZ and transver
se-field Ising models with and\nwithout next-nearest-neighbor interactions
.\n\nReferences: arXiv:1905.07760\, arXiv:1912.10045\, arXiv:2010.07265\n
END:VEVENT
BEGIN:VEVENT
SUMMARY:Robert De Mello Koch
DTSTART;VALUE=DATE-TIME:20201118T170000Z
DTEND;VALUE=DATE-TIME:20201118T180000Z
DTSTAMP;VALUE=DATE-TIME:20201029T100959Z
UID:UKYhepth/21
DESCRIPTION:Title: Scrambling in Yang-Mills Theory\nby Robert De Mello Koc
h as part of Theoretical Physics Seminars (Kentucky)\n\n\nAbstract\nWe stu
dy operators with a bare dimension that grows as N^2 in the large N limit.
These operators are labeled by a Young diagram with p long rows\, as well
as a graph\, with p nodes. The dilatation operator describing the mixing
of these operators defines a Hamiltonian for excitations hopping on this g
raph. The scrambling and equilibration of the resulting dynamics is studie
d.\n
END:VEVENT
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