Home » Events

Archived Events

Posted in

To narrow the list of events displayed please select year and event type or fill the search fields, then press Apply.

The Broadhurst-Kreimer conjecture and multiple zeta values

Posted in
Speaker: 
Sarah Carr
Affiliation: 
U Paris-Sud, Orsay
Date: 
Wed, 2010-04-21 16:30 - 17:30
Location: 
MPIM Lecture Hall
Parent event: 
Number theory lunch seminar

Broadhurst and Kreimer proposed a Poincare series for the algebra of multiple zeta values based on large scale numerical computations. In this talk, I will explain how the coefficients in their series are related to period polynomials and to structural properties of the formal multizeta value (double shuffle) Lie algebra.

Galois cohomology

Posted in
Speaker: 
G. Scaria
Date: 
Wed, 2010-04-21 16:30 - 17:30
Parent event: 
IMPRS-seminar on modularity

Bounds for arithmetic intersection numbers

Posted in
Speaker: 
Ulf Kühn
Affiliation: 
Hamburg
Date: 
Wed, 2010-04-21 14:15 - 15:15
Location: 
MPIM Lecture Hall
Parent event: 
Number theory lunch seminar

Arakelov geometry associates to an arithmetic surfaces an intrinsic invariant: the arithmetic self-intersection number of the dualizing sheaf. In this talk a result that implies upper bounds for this real number in particular for Fermat curves and modular curves will be presented.

Vector Bundles II

Posted in
Speaker: 
M. Hoffmann
Date: 
Wed, 2010-04-21 12:15 - 13:15
Parent event: 
IMPRS-seminar on K-theory

Some constructions of new groups and buildings

Posted in
Speaker: 
Kathrin Tent
Affiliation: 
Bielefeld
Date: 
Tue, 2010-04-20 16:30 - 17:30
Location: 
MPIM Lecture Hall

We give model theoretic constructions for a zoo of examples and counterexamples: we build groups and generalized n-gons satisfying strong transitivity properties. An ultraproduct of the latter yields a forest from which we obtain twin trees and homogeneous 1-round CAT(1)-spaces.

On Kac-Moody groups over rings

Posted in
Speaker: 
Ralf Gramlich
Affiliation: 
Darmstadt
Date: 
Tue, 2010-04-20 14:00 - 15:00
Location: 
MPIM Lecture Hall

A split Kac-Moody group $G$ over a topological ring $R$ carries a natural topology defined by Kac and Peterson. In case the underlying topological ring $R$ is $k_\omega$, this turns the Kac-Moody group $G$ into a $k_\omega$ group, which allows for a certain amount of control over this topology. Each $\sigma$-compact locally compact ring is a $k_\omega$ ring, hence the above topology allows to study $S$-arithmetic subgroups of topological Kac-Moody groups over local fields.

Fontaine-Lafaille theory II

Posted in
Speaker: 
G. Faltings
Date: 
Tue, 2010-04-20 12:00 - 13:00
Location: 
MPIM Lecture Hall

Vector Bundles I

Posted in
Speaker: 
M. Hoffmann
Date: 
Tue, 2010-04-20 10:15 - 11:15
Parent event: 
IMPRS-seminar on K-theory

Moduli varieties of real and quaternionic bundles over a curve

Posted in
Speaker: 
Florent Schaffhauser
Affiliation: 
IHES/ MPI
Date: 
Mon, 2010-04-19 15:00 - 16:00
Location: 
MPIM Lecture Hall
Parent event: 
Topics in Topology

We examine the moduli problem for real and quaternionic vector bundles over a curve, and we give a gauge-theoretic construction of would-be moduli varieties for such bundles. These moduli varieties are irreducible subsets of real points inside a complex projective variety. We relate our point of view to previous work by Biswas, Huisman and Hurtubise, and we use this to study Gal(C/R)-actions on moduli varieties of semistable holomorphic bundles over a complex curve with a given real structure.

Representations of braid groups and quantum groups

Posted in
Speaker: 
Alexandre Kosyak
Affiliation: 
Inst of Math., Kiev/MPI
Date: 
Thu, 2010-04-15 15:00 - 16:00
Location: 
MPIM Lecture Hall
Parent event: 
MPI-Oberseminar

We construct some representations of braid groups, arising from the representations of quantum groups.

© MPI f. Mathematik, Bonn Impressum
-A A +A