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BEGIN:VEVENT
SUMMARY:Arnaud Beauville (Université de Nice)
DTSTART;VALUE=DATE-TIME:20200429T140000Z
DTEND;VALUE=DATE-TIME:20200429T150000Z
DTSTAMP;VALUE=DATE-TIME:20240715T175052Z
UID:HUBerlinAlgGeo/1
DESCRIPTION:Title: Vector bundles on Fano threefolds and K3 surfaces\nby Arnaud Be
auville (Université de Nice) as part of HU Berlin algebraic geometry semi
nar\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/HUBerlinAlgGeo/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Daniel Erman (University of Wisconsin - Madison)
DTSTART;VALUE=DATE-TIME:20200506T140000Z
DTEND;VALUE=DATE-TIME:20200506T150000Z
DTSTAMP;VALUE=DATE-TIME:20240715T175052Z
UID:HUBerlinAlgGeo/2
DESCRIPTION:Title: Limits of polynomials rings\nby Daniel Erman (University of Wis
consin - Madison) as part of HU Berlin algebraic geometry seminar\n\n\nAbs
tract\nI will discuss two ways to think about a limit of a\npolynomial rin
g in $n$ variables as $n$ goes to infinity\, and how this can\nbe used to
study complexity problems in algebraic geometry. This is\njoint work with
Steven V Sam and Andrew Snowden.\n
LOCATION:https://researchseminars.org/talk/HUBerlinAlgGeo/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Riccardo Salvati Manni (Università degli studi di Roma "La Sapien
za")
DTSTART;VALUE=DATE-TIME:20200513T140000Z
DTEND;VALUE=DATE-TIME:20200513T150000Z
DTSTAMP;VALUE=DATE-TIME:20240715T175052Z
UID:HUBerlinAlgGeo/3
DESCRIPTION:Title: The Kodaira dimension of the moduli space of abelian varieties of d
imension 6.\nby Riccardo Salvati Manni (Università degli studi di Rom
a "La Sapienza") as part of HU Berlin algebraic geometry seminar\n\nAbstra
ct: TBA\n
LOCATION:https://researchseminars.org/talk/HUBerlinAlgGeo/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Patrick Brosnan (University of Maryland)
DTSTART;VALUE=DATE-TIME:20200520T140000Z
DTEND;VALUE=DATE-TIME:20200520T150000Z
DTSTAMP;VALUE=DATE-TIME:20240715T175052Z
UID:HUBerlinAlgGeo/4
DESCRIPTION:Title: Fixed points in toroidal compactifications and essential dimension
of covers.\nby Patrick Brosnan (University of Maryland) as part of HU
Berlin algebraic geometry seminar\n\n\nAbstract\nWe (Najmuddin Fakhruddin
and I) prove a fixed point theorem for the action of certain local monodro
my groups on etale covers and use it to deduce lower bounds on essential d
imension of covers. In particular\, we can give geometric proofs of many (
but definitely not all) of the results in a recent preprint of Farb\, Kisi
n and Wolfson. Moreover\, we can extend their incompressibility results fo
r Hodge type Shimura varieties to certain Shimura varieties for E7 (those
with 0-dimensional rational boundary components).\n
LOCATION:https://researchseminars.org/talk/HUBerlinAlgGeo/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mihnea Popa (Northwestern University)
DTSTART;VALUE=DATE-TIME:20200610T150000Z
DTEND;VALUE=DATE-TIME:20200610T160000Z
DTSTAMP;VALUE=DATE-TIME:20240715T175052Z
UID:HUBerlinAlgGeo/5
DESCRIPTION:Title: Minimal exponents of singularities\nby Mihnea Popa (Northwester
n University) as part of HU Berlin algebraic geometry seminar\n\n\nAbstrac
t\nThe minimal exponent of a function is the negative of the largest root
of its reduced Bernstein-Sato polynomial. It refines the notion of log can
onical threshold\, and it is related (sometimes conjecturally) to other in
teresting objects\, for instance the Igusa zeta function. I will describe
some results towards understanding minimal exponents\, based on viewing th
em in the context of D-modules and Hodge theory on one hand\, and biration
al geometry on the other. This is joint work with Mircea Mustata.\n
LOCATION:https://researchseminars.org/talk/HUBerlinAlgGeo/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Egor Yasinsky (Universität Basel)
DTSTART;VALUE=DATE-TIME:20200624T140000Z
DTEND;VALUE=DATE-TIME:20200624T150000Z
DTSTAMP;VALUE=DATE-TIME:20240715T175052Z
UID:HUBerlinAlgGeo/6
DESCRIPTION:Title: Cremona groups and their subgroups\nby Egor Yasinsky (Universit
ät Basel) as part of HU Berlin algebraic geometry seminar\n\n\nAbstract\n
The Cremona group is a group of birational automorphisms of a projective s
pace. Its study goes back to classical works of Cremona\, Noehter\, Castel
nuovo and Bertini\, and it has been a subject of very intensive research d
uring the last 15 years. This study employs different techniques - from mo
dern birational geometry (e.g. Mori theory\, Sarkisov program\, and Cauche
r Birkar's works) to geometric group theory. In this talk\, I will try to
overview three plots on Cremona groups: classification of finite subgroups
\, topological properties\, infinite subgroups and quotients of Cremona gr
oups.\n
LOCATION:https://researchseminars.org/talk/HUBerlinAlgGeo/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yuri Tschinkel (New York University)
DTSTART;VALUE=DATE-TIME:20200617T140000Z
DTEND;VALUE=DATE-TIME:20200617T150000Z
DTSTAMP;VALUE=DATE-TIME:20240715T175052Z
UID:HUBerlinAlgGeo/7
DESCRIPTION:Title: Equivariant birational geometry\nby Yuri Tschinkel (New York Un
iversity) as part of HU Berlin algebraic geometry seminar\n\n\nAbstract\nI
will discuss new invariants in equivariant birational geometry (joint wor
k with Kontsevich and Pestun).\n
LOCATION:https://researchseminars.org/talk/HUBerlinAlgGeo/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rahul Pandharipande (ETH Zürich)
DTSTART;VALUE=DATE-TIME:20200701T130000Z
DTEND;VALUE=DATE-TIME:20200701T140000Z
DTSTAMP;VALUE=DATE-TIME:20240715T175052Z
UID:HUBerlinAlgGeo/8
DESCRIPTION:Title: The moduli spaces of differentials on curves\nby Rahul Pandhari
pande (ETH Zürich) as part of HU Berlin algebraic geometry seminar\n\n\nA
bstract\nThe moduli space of pairs $(C\,f)$ where $C$ is a curve and $f$ i
s a rational function leads to the well-developed theory of Hurwitz spaces
. The study of the moduli of $(C\,\\omega)$ where $C$ is a curve and $\\om
ega$ is a meromorphic differential is a younger subject. I will discuss re
cent developments in the study of the moduli spaces of holomorphic/meromor
phic differentials on curves. Many of the basic questions about cycle clas
ses and integrals have now been solved (through the work of many people) -
- but there are also several interesting open directions.\n
LOCATION:https://researchseminars.org/talk/HUBerlinAlgGeo/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Adrien Sauvaget (Université de Cergy Pontoise)
DTSTART;VALUE=DATE-TIME:20200527T140000Z
DTEND;VALUE=DATE-TIME:20200527T150000Z
DTSTAMP;VALUE=DATE-TIME:20240715T175052Z
UID:HUBerlinAlgGeo/9
DESCRIPTION:Title: Moduli spaces of large pluricanonical divisors\nby Adrien Sauva
get (Université de Cergy Pontoise) as part of HU Berlin algebraic geometr
y seminar\n\n\nAbstract\nWe consider the moduli spaces of curves endowed w
ith a $k$-canonical divisor. The purpose of the talk is to explain that th
e geometry of moduli spaces of metric surfaces can be studied by consideri
ng the large $k$-behavior of these moduli spaces. The first application of
this strategy is a proof of the finiteness of the volumes of moduli space
s of flat surfaces with conical singularities. The second one is a conject
ure on the volumes of moduli spaces of hyperbolic cone surfaces.\n
LOCATION:https://researchseminars.org/talk/HUBerlinAlgGeo/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:András Lőrincz (Humboldt-Universität zu Berlin)
DTSTART;VALUE=DATE-TIME:20200603T140000Z
DTEND;VALUE=DATE-TIME:20200603T150000Z
DTSTAMP;VALUE=DATE-TIME:20240715T175052Z
UID:HUBerlinAlgGeo/10
DESCRIPTION:Title: Equivariant D-modules\nby András Lőrincz (Humboldt-Universit
ät zu Berlin) as part of HU Berlin algebraic geometry seminar\n\n\nAbstra
ct\nIn this talk\, I will discuss some results concerning equivariant\nD-m
odules. Under suitable finiteness conditions\, the category of such\nobjec
ts on a stratification is equivalent to the category of\nfinite-dimensiona
l representations of a quiver. We describe such\nquivers explicitly for so
me irreducible representations of complex\nreductive groups and toric vari
eties. In these cases we use the\nresults to find the explicit D-module st
ructure of local cohomology\nmodules supported in orbit closures. Other ap
plications include\nLyubeznik numbers and intersection cohomology groups o
f orbit\nclosures.\n
LOCATION:https://researchseminars.org/talk/HUBerlinAlgGeo/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mircea Mustaţă (University of Michigan)
DTSTART;VALUE=DATE-TIME:20200617T151500Z
DTEND;VALUE=DATE-TIME:20200617T161500Z
DTSTAMP;VALUE=DATE-TIME:20240715T175052Z
UID:HUBerlinAlgGeo/11
DESCRIPTION:Title: Minimal exponents of hypersurfaces and a conjecture of Teissier\nby Mircea Mustaţă (University of Michigan) as part of HU Berlin algeb
raic geometry seminar\n\n\nAbstract\nThe minimal exponent of a hypersurfac
e is a refinement of the log canonical threshold\, a fundamental\ninvarian
t of singularities in birational geometry. After a brief introduction to t
hese invariants\, I will discuss work on\na conjecture of Teissier\, relat
ing the invariant of a hypersurface with that of a hyperplane section. Thi
s is joint work\n(partially in progress) with Eva Elduque and Bradley Dirk
s.\n
LOCATION:https://researchseminars.org/talk/HUBerlinAlgGeo/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Elisabetta Colombo
DTSTART;VALUE=DATE-TIME:20200708T140000Z
DTEND;VALUE=DATE-TIME:20200708T150000Z
DTSTAMP;VALUE=DATE-TIME:20240715T175052Z
UID:HUBerlinAlgGeo/12
DESCRIPTION:Title: The dimension of the Voisin sets in the moduli space of abelian va
rieties\nby Elisabetta Colombo as part of HU Berlin algebraic geometry
seminar\n\n\nAbstract\nI will discuss reseach in collaboration with Naran
jo and\nPirola on the subsets $V_k(A)$ of an abelian variety $A$\, consist
ing of\nthose points $x$ such that the\nzero-cycle $x-O$ is $k$-nilpotent
with respect to the Pontryaghin product.\nThese sets were initially introd
uced and studied by Claire Voisin. We\nfind a sharp upper bound of the dim
ension in moduli of the locus of\nthose abelian varieties $A$ for which $V
_2(A)$ is positive dimensional.\n
LOCATION:https://researchseminars.org/talk/HUBerlinAlgGeo/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alexandru Suciu
DTSTART;VALUE=DATE-TIME:20200715T150000Z
DTEND;VALUE=DATE-TIME:20200715T160000Z
DTSTAMP;VALUE=DATE-TIME:20240715T175052Z
UID:HUBerlinAlgGeo/13
DESCRIPTION:Title: Poincaré duality and cohomology jump loci\nby Alexandru Suciu
as part of HU Berlin algebraic geometry seminar\n\n\nAbstract\nThe cohomo
logy jump loci of a space $X$ are of two basic\ntypes: the characteristic
varieties\, defined in terms of homology with coefficients in rank one loc
al systems\, and the resonance varieties\, constructed from information en
coded in either the cohomology ring\, or an algebraic model for $X$. We w
ill explore in this talk the geometry of these varieties and the delicate
interplay between them in the context of compact\, orientable 3-manifolds.
In the process\, we will arrive at a fairly precise geometric descriptio
n of the resonance varieties $R^i_k(A)$ of a 3-dimensional Poincaré duali
ty algebra $A$.\n
LOCATION:https://researchseminars.org/talk/HUBerlinAlgGeo/13/
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