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BEGIN:VEVENT
SUMMARY:Arnaud Beauville (Université de Nice)
DTSTART:20200429T140000Z
DTEND:20200429T150000Z
DTSTAMP:20260404T111133Z
UID:HUBerlinAlgGeo/1
DESCRIPTION:Title: Vector bundles on Fano threefolds and K3 surfaces\nby Ar
naud Beauville (Université de Nice) as part of HU Berlin algebraic geomet
ry seminar\n\nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/HUBerlinAlgGeo/1/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Daniel Erman (University of Wisconsin - Madison)
DTSTART:20200506T140000Z
DTEND:20200506T150000Z
DTSTAMP:20260404T111133Z
UID:HUBerlinAlgGeo/2
DESCRIPTION:Title: Limits of polynomials rings\nby Daniel Erman (University
of Wisconsin - Madison) as part of HU Berlin algebraic geometry seminar\n
\n\nAbstract\nI will discuss two ways to think about a limit of a\npolynom
ial ring in $n$ variables as $n$ goes to infinity\, and how this can\nbe u
sed to study complexity problems in algebraic geometry. This is\njoint wo
rk with Steven V Sam and Andrew Snowden.\n
LOCATION:https://stable.researchseminars.org/talk/HUBerlinAlgGeo/2/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Riccardo Salvati Manni (Università degli studi di Roma "La Sapien
za")
DTSTART:20200513T140000Z
DTEND:20200513T150000Z
DTSTAMP:20260404T111133Z
UID:HUBerlinAlgGeo/3
DESCRIPTION:Title: The Kodaira dimension of the moduli space of abelian varieti
es of dimension 6.\nby Riccardo Salvati Manni (Università degli studi
di Roma "La Sapienza") as part of HU Berlin algebraic geometry seminar\n\
nAbstract: TBA\n
LOCATION:https://stable.researchseminars.org/talk/HUBerlinAlgGeo/3/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Patrick Brosnan (University of Maryland)
DTSTART:20200520T140000Z
DTEND:20200520T150000Z
DTSTAMP:20260404T111133Z
UID:HUBerlinAlgGeo/4
DESCRIPTION:Title: Fixed points in toroidal compactifications and essential dim
ension of covers.\nby Patrick Brosnan (University of Maryland) as part
of HU Berlin algebraic geometry seminar\n\n\nAbstract\nWe (Najmuddin Fakh
ruddin and I) prove a fixed point theorem for the action of certain local
monodromy groups on etale covers and use it to deduce lower bounds on esse
ntial dimension of covers. In particular\, we can give geometric proofs of
many (but definitely not all) of the results in a recent preprint of Farb
\, Kisin and Wolfson. Moreover\, we can extend their incompressibility res
ults for Hodge type Shimura varieties to certain Shimura varieties for E7
(those with 0-dimensional rational boundary components).\n
LOCATION:https://stable.researchseminars.org/talk/HUBerlinAlgGeo/4/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mihnea Popa (Northwestern University)
DTSTART:20200610T150000Z
DTEND:20200610T160000Z
DTSTAMP:20260404T111133Z
UID:HUBerlinAlgGeo/5
DESCRIPTION:Title: Minimal exponents of singularities\nby Mihnea Popa (Nort
hwestern University) as part of HU Berlin algebraic geometry seminar\n\n\n
Abstract\nThe minimal exponent of a function is the negative of the larges
t root of its reduced Bernstein-Sato polynomial. It refines the notion of
log canonical threshold\, and it is related (sometimes conjecturally) to o
ther interesting objects\, for instance the Igusa zeta function. I will de
scribe some results towards understanding minimal exponents\, based on vie
wing them in the context of D-modules and Hodge theory on one hand\, and b
irational geometry on the other. This is joint work with Mircea Mustata.\n
LOCATION:https://stable.researchseminars.org/talk/HUBerlinAlgGeo/5/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Egor Yasinsky (Universität Basel)
DTSTART:20200624T140000Z
DTEND:20200624T150000Z
DTSTAMP:20260404T111133Z
UID:HUBerlinAlgGeo/6
DESCRIPTION:Title: Cremona groups and their subgroups\nby Egor Yasinsky (Un
iversität Basel) as part of HU Berlin algebraic geometry seminar\n\n\nAbs
tract\nThe Cremona group is a group of birational automorphisms of a proje
ctive space. Its study goes back to classical works of Cremona\, Noehter\,
Castelnuovo and Bertini\, and it has been a subject of very intensive res
earch during the last 15 years. This study employs different techniques -
from modern birational geometry (e.g. Mori theory\, Sarkisov program\, and
Caucher Birkar's works) to geometric group theory. In this talk\, I will
try to overview three plots on Cremona groups: classification of finite su
bgroups\, topological properties\, infinite subgroups and quotients of Cre
mona groups.\n
LOCATION:https://stable.researchseminars.org/talk/HUBerlinAlgGeo/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yuri Tschinkel (New York University)
DTSTART:20200617T140000Z
DTEND:20200617T150000Z
DTSTAMP:20260404T111133Z
UID:HUBerlinAlgGeo/7
DESCRIPTION:Title: Equivariant birational geometry\nby Yuri Tschinkel (New
York University) as part of HU Berlin algebraic geometry seminar\n\n\nAbst
ract\nI will discuss new invariants in equivariant birational geometry (jo
int work with Kontsevich and Pestun).\n
LOCATION:https://stable.researchseminars.org/talk/HUBerlinAlgGeo/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Rahul Pandharipande (ETH Zürich)
DTSTART:20200701T130000Z
DTEND:20200701T140000Z
DTSTAMP:20260404T111133Z
UID:HUBerlinAlgGeo/8
DESCRIPTION:Title: The moduli spaces of differentials on curves\nby Rahul P
andharipande (ETH Zürich) as part of HU Berlin algebraic geometry seminar
\n\n\nAbstract\nThe moduli space of pairs $(C\,f)$ where $C$ is a curve an
d $f$ is 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 an
d $\\omega$ is a meromorphic differential is a younger subject. I will dis
cuss recent developments in the study of the moduli spaces of holomorphic/
meromorphic differentials on curves. Many of the basic questions about cyc
le classes and integrals have now been solved (through the work of many pe
ople) -- but there are also several interesting open directions.\n
LOCATION:https://stable.researchseminars.org/talk/HUBerlinAlgGeo/8/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Adrien Sauvaget (Université de Cergy Pontoise)
DTSTART:20200527T140000Z
DTEND:20200527T150000Z
DTSTAMP:20260404T111133Z
UID:HUBerlinAlgGeo/9
DESCRIPTION:Title: Moduli spaces of large pluricanonical divisors\nby Adrie
n Sauvaget (Université de Cergy Pontoise) as part of HU Berlin algebraic
geometry seminar\n\n\nAbstract\nWe consider the moduli spaces of curves en
dowed with a $k$-canonical divisor. The purpose of the talk is to explain
that the geometry of moduli spaces of metric surfaces can be studied by co
nsidering the large $k$-behavior of these moduli spaces. The first applica
tion of this strategy is a proof of the finiteness of the volumes of modul
i spaces of flat surfaces with conical singularities. The second one is a
conjecture on the volumes of moduli spaces of hyperbolic cone surfaces.\n
LOCATION:https://stable.researchseminars.org/talk/HUBerlinAlgGeo/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:András Lőrincz (Humboldt-Universität zu Berlin)
DTSTART:20200603T140000Z
DTEND:20200603T150000Z
DTSTAMP:20260404T111133Z
UID:HUBerlinAlgGeo/10
DESCRIPTION:Title: Equivariant D-modules\nby András Lőrincz (Humboldt-Un
iversität zu Berlin) as part of HU Berlin algebraic geometry seminar\n\n\
nAbstract\nIn this talk\, I will discuss some results concerning equivaria
nt\nD-modules. Under suitable finiteness conditions\, the category of such
\nobjects on a stratification is equivalent to the category of\nfinite-dim
ensional representations of a quiver. We describe such\nquivers explicitly
for some irreducible representations of complex\nreductive groups and tor
ic varieties. In these cases we use the\nresults to find the explicit D-mo
dule structure of local cohomology\nmodules supported in orbit closures. O
ther applications include\nLyubeznik numbers and intersection cohomology g
roups of orbit\nclosures.\n
LOCATION:https://stable.researchseminars.org/talk/HUBerlinAlgGeo/10/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mircea Mustaţă (University of Michigan)
DTSTART:20200617T151500Z
DTEND:20200617T161500Z
DTSTAMP:20260404T111133Z
UID:HUBerlinAlgGeo/11
DESCRIPTION:Title: Minimal exponents of hypersurfaces and a conjecture of Teis
sier\nby Mircea Mustaţă (University of Michigan) as part of HU Berli
n algebraic geometry seminar\n\n\nAbstract\nThe minimal exponent of a hype
rsurface is a refinement of the log canonical threshold\, a fundamental\ni
nvariant of singularities in birational geometry. After a brief introducti
on to these invariants\, I will discuss work on\na conjecture of Teissier\
, relating the invariant of a hypersurface with that of a hyperplane secti
on. This is joint work\n(partially in progress) with Eva Elduque and Bradl
ey Dirks.\n
LOCATION:https://stable.researchseminars.org/talk/HUBerlinAlgGeo/11/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Elisabetta Colombo
DTSTART:20200708T140000Z
DTEND:20200708T150000Z
DTSTAMP:20260404T111133Z
UID:HUBerlinAlgGeo/12
DESCRIPTION:Title: The dimension of the Voisin sets in the moduli space of abe
lian varieties\nby Elisabetta Colombo as part of HU Berlin algebraic g
eometry seminar\n\n\nAbstract\nI will discuss reseach in collaboration wit
h Naranjo and\nPirola on the subsets $V_k(A)$ of an abelian variety $A$\,
consisting of\nthose points $x$ such that the\nzero-cycle $x-O$ is $k$-nil
potent with respect to the Pontryaghin product.\nThese sets were initially
introduced and studied by Claire Voisin. We\nfind a sharp upper bound of
the dimension in moduli of the locus of\nthose abelian varieties $A$ for w
hich $V_2(A)$ is positive dimensional.\n
LOCATION:https://stable.researchseminars.org/talk/HUBerlinAlgGeo/12/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Alexandru Suciu
DTSTART:20200715T150000Z
DTEND:20200715T160000Z
DTSTAMP:20260404T111133Z
UID:HUBerlinAlgGeo/13
DESCRIPTION:Title: Poincaré duality and cohomology jump loci\nby Alexandr
u Suciu as part of HU Berlin algebraic geometry seminar\n\n\nAbstract\nThe
cohomology jump loci of a space $X$ are of two basic\ntypes: the characte
ristic varieties\, defined in terms of homology with coefficients in rank
one local systems\, and the resonance varieties\, constructed from informa
tion encoded in either the cohomology ring\, or an algebraic model for $X
$. We will explore in this talk the geometry of these varieties and the de
licate interplay between them in the context of compact\, orientable 3-man
ifolds. In the process\, we will arrive at a fairly precise geometric des
cription of the resonance varieties $R^i_k(A)$ of a 3-dimensional Poincar
é duality algebra $A$.\n
LOCATION:https://stable.researchseminars.org/talk/HUBerlinAlgGeo/13/
END:VEVENT
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