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Talks and seminars, possibly part of a conference or series.

Galois action on knots

Posted in
Speaker: 
Hidekazu Furusho
Zugehörigkeit: 
Nagoya U/MPI
Datum: 
Don, 2013-06-13 15:00 - 16:00
Location: 
MPIM Lecture Hall
Parent event: 
MPI-Oberseminar

My talk  is on my attempt in arithmetic topology. I will discuss an
arithmetic structure on knots;
I will show that the absolute Galois group of the rational number
field acts non-trivially on 'the space of knots' in a non-trivial way.

tba

Posted in
Speaker: 
Ben Davidson
Datum: 
Mit, 2013-07-17 10:30 - 12:00
Location: 
MPIM Lecture Hall
Parent event: 
Higher Differential Geometry Seminar

tba

Posted in
Speaker: 
Ludmil Katzarkov
Zugehörigkeit: 
U Wien/MPI
Datum: 
Don, 2013-07-11 10:30 - 12:00
Location: 
MPIM Lecture Hall
Parent event: 
Seminar Algebraic Geometry (SAG)

The title of my talk should be: "Characteristic classes of singular toric varieties

Posted in
Speaker: 
L. Maxim
Datum: 
Don, 2013-07-11 15:00 - 16:00
Location: 
MPIM Lecture Hall
Parent event: 
MPI-Oberseminar

I will discuss the computation of the homology Hirzebruch
characteristic classes of (possibly singular) toric varieties. I will
present two different perspectives for the computation of these
characteristic classes. First, by taking advantage of the torus-orbit
decomposition and the motivic properties of the homology Hirzebruch
classes, we express the latter in terms of the (dual) Todd classes of
closures of orbits. The obtained formula is then applied to  weighted
lattice point counting in lattice polytopes. Secondly, in the case of

tba

Posted in
Speaker: 
Ludmil Katzarkov
Zugehörigkeit: 
U Wien/MPI
Datum: 
Don, 2013-07-11 10:30 - 12:00
Location: 
MPIM Lecture Hall
Parent event: 
Seminar Algebraic Geometry (SAG)

Green's functions on Riemann surfaces III

Posted in
Speaker: 
Don Zagier
Datum: 
Mon, 2013-06-17 12:00 - 13:30
Location: 
MPIM Lecture Hall
Parent event: 
IMPRS Minicourse

Green's functions on Riemann surfaces II

Posted in
Speaker: 
Don Zagier
Datum: 
Don, 2013-06-13 12:00 - 13:30
Location: 
MPIM Lecture Hall
Parent event: 
IMPRS Minicourse

Green's functions on Riemann surfaces I

Posted in
Speaker: 
Don Zagier
Datum: 
Mon, 2013-06-10 12:00 - 13:30
Location: 
MPIM Lecture Hall
Parent event: 
IMPRS Minicourse

A theorem of Narasimhan and Seshadri (following Donaldson)

Posted in
Speaker: 
S. Lanzat
Datum: 
Mon, 2013-06-03 14:15 - 15:45
Location: 
MPIM Seminar Room
Parent event: 
IMPRS-seminar on moduli of G-bundles

Optimal spherical designs

Posted in
Speaker: 
Maryna Viazovska
Zugehörigkeit: 
MPIM
Datum: 
Mon, 2013-05-27 16:00 - 17:00
Location: 
MPIM Lecture Hall
Parent event: 
Mathematische Arbeitstagung 2013

Fibrations and Adjunctions for quasicategories

Posted in
Speaker: 
Daniel Brügmann
Datum: 
Fre, 2013-06-07 13:30 - 15:00
Location: 
MPIM Seminar Room
Parent event: 
Student seminar on higher categories

 

The Fourier decomposition on the Chow ring of certain hyperkaehler fourfolds

Posted in
Speaker: 
Charles Vial
Zugehörigkeit: 
Cambridge
Datum: 
Don, 2013-06-06 10:30 - 12:00
Location: 
MPIM Seminar Room
Parent event: 
Seminar Algebraic Geometry (SAG)

Using a codimension-1 algebraic cycle obtained from the Poincare line bundle, Beauville defined the Fourier transform on the Chow ring of an abelian variety A and showed that the Fourier transform induces a decomposition of the Chow ring CH_*(A) which is compatible with its ring structure. We prove that a similar decomposition exists for certain hyperkaehler fourfolds by using a codimension-2 algebraic cycle representing the Beauville--Bogomolov bilinear form. This is joint work with Mingmin Shen.

Kudla's modularity conjecture for cycles of codimension 2

Posted in
Speaker: 
Martin Raum
Zugehörigkeit: 
ETH
Datum: 
Mit, 2013-05-29 14:15 - 15:15
Location: 
MPIM Lecture Hall
Parent event: 
Number theory lunch seminar 
We establish Kudla's modularity conjecture for the generating function 
of special cycles of codimension 2.  The proof is based on a 
convergence result for formal Fourier Jacobi expansions.  We define 
such expansions in some simple cases, and outline the approach taken to 
show that they always converge.  Finally, we showcase the connection to 
previous results by Zhang, which yields the desired proof of Kudla's 
conjecture.

Topos Theory

Posted in
Speaker: 
D. Carchedi
Datum: 
Mit, 2013-05-29 16:15 - 18:00
Location: 
MPIM Seminar Room
Parent event: 
Master's Course on Topos Theory

Bachelor/Master-Seminar Darstellungstheorie

Posted in
Speaker: 
Georgie Williamson
Zugehörigkeit: 
MPI
Datum: 
Die, 2013-05-21 13:00 - 16:00
Location: 
MPIM Seminar Room
Parent event: 
Bachelor/Master-Seminar

Yang-Mills stratification versa Harder-Narasimhan stratification

Posted in
Speaker: 
S. Behrens
Datum: 
Die, 2013-05-21 10:15 - 11:45
Location: 
MPIM Seminar Room
Parent event: 
IMPRS-seminar on moduli of G-bundles

Representation equivalence, characteristic equivalence and commensurability of arithmetic lattices

Posted in
Speaker: 
C. Rajan
Zugehörigkeit: 
TIFR/MPI
Datum: 
Die, 2013-05-21 15:10 - 16:00
Location: 
MPIM Lecture Hall
Parent event: 
Number theory lunch seminar

Gopal Prasad and A. S. Rapinchuk defined a notion of weakly
commensurable lattices in a semisimple group, and gave a
classification of weakly commensurable Zariski dense subgroups. A
motivation was to classify pairs of locally symmetric spaces
isospectral with respect to the Laplacian on functions. For this, in
higher ranks, they assume the validity of Schanuel's conjecture.
In this talk, we observe that if we use the stronger notion of
representation equivalence of lattices, then Schanuel's conjecture can

Topology of algebraic varieties and perverse sheaves IV

Posted in
Speaker: 
Geordie Williamson
Datum: 
Die, 2013-05-21 16:30 - 18:00
Location: 
MPIM Lecture Hall
Parent event: 
IMPRS Minicourse

Noncommutative Local Monodromy Theorem

Posted in
Speaker: 
Vadim Vologodsky
Zugehörigkeit: 
U of Oregon/MPI
Datum: 
Don, 2013-05-16 13:30 - 14:30
Location: 
MPIM Lecture Hall
Parent event: 
Seminar on Algebra, Geometry and Physics
Let  X \to D^* be a smooth projective variety over the formal punctured disk D^*=spec K= spec \bC((t)).
   The Griffiths-Landman-Grothendieck ``Local Monodromy Theorem'' asserts that
the Gauss-Manin connection on the de Rham cohomology H^*_{DR}(X/D^*)  has a regular  singularity at the origin and that the monodromy of this connection is quasi-unipotent.

Iterated disc constructions in 4-manifold topology (Semester on 4-manifolds)

Posted in
Speaker: 
Peter Teichner
Datum: 
Mon, 2013-05-13 16:30 - 18:00
Location: 
MPIM Lecture Hall
Parent event: 
Lecture Series on 4-manifolds
Video: 
video/mp4 icon20130513_teichner1a.mp4
video/mp4 icon20130513_teichner1b.mp4
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