# Kommende Vorträge

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Ausführliche Liste aller demnächst stattfindenden Vorträge und Seminare. Für eine Übersicht konsultieren Sie bitte auch den Kalender.

## Introduction to elliptic cohomology

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Speaker:
Augusto Stoffel
Zugehörigkeit:
MPIM
Datum:
Mon, 2018-05-28 16:30 - 18:00
Location:
MPIM Lecture Hall
Parent event:
MPIM Topology Seminar

## Basics of the BV formalism - Part 2

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Speaker:
Michele Schiavina
Zugehörigkeit:
University of California, Berkeley/MPIM
Datum:
Die, 2018-05-29 10:15 - 12:00
Location:
MPIM Seminar Room

If the Batalin-Vilkovisky formalism is a cohomological handle for field theories in the Lagrangian formalism, a similar construction can be set up for the associated Hamiltonian picture and goes under the name of Batalin, Fradkin and Vilkovisky (BFV).
The link between the two has been made explicit recently by Cattaneo, Mnev and Reshetikhin (CMR) as a tool to treat field theories on manifolds with boundary.
In this talk I will review the basics of the BFV and CMR constructions and show how they relate to what we have done so far.

## Gromov-Hausdorff limits of curves with flat metrics and non-Archimedean geometry

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Speaker:
Dmitry Sustretov
Zugehörigkeit:
Université de Lille I/MPIM
Datum:
Die, 2018-05-29 14:00 - 15:00
Location:
MPIM Lecture Hall

The subject of this talk is the study of the Gromov-Hausdorff limit of
a family of complex curves over a punctured disc with maximal
unipotent monodromy endowed with normalized flat metrics with conical
singularities. The limit turns out to be a metric graph which can be
naturally identified with a quotient of a subset of the Berkovich
analytic space associated to the family. This problem is inspired by
the approach of Kontsevich and Soibelman to the SYZ conjecture, and,
time permitting, I will discuss how the techniques of the talk can be

## The essential coexistence phenomenon in Hamiltonian dynamics

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Speaker:
Yakov Pesin
Zugehörigkeit:
Penn State University
Datum:
Die, 2018-05-29 15:00 - 16:00
Location:
MPIM Seminar Room

I will discuss a phenomenon of the essential coexistence of regular (zero Lyapunov exponents and hence, zero entropy) dynamics and chaotic (non-zero Lyapunov exponents and positive entropy) dynamics in the setting of smooth dynamical systems. I will review some recent results in this direction, discuss some open problems and describe some new examples of essential coexistence. In particular, I will outline a construction of a Hamiltonian system which demonstrate a "complete? KAM-type picture of coexistence of invariant KAM tori and surrounding "chaotic sea".

## Classical torsion and L^2-torsion I

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Speaker:
Wolfgang Lück
Organiser(s):
Wolfgang Lück, Peter Teichner
Zugehörigkeit:
Universität Bonn
Datum:
Die, 2018-05-29 15:15 - 17:00
Location:
MPIM Lecture Hall

## tba

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Speaker:
Giorgio Trentinaglia
Zugehörigkeit:
Instituto Superior Tecnico, Lisbon
Datum:
Mit, 2018-05-30 10:30 - 12:00
Location:
MPIM Lecture Hall

## A universal Torelli-Tate theorem for elliptic surfaces

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Speaker:
C. S. Rajan
Zugehörigkeit:
TIFR/MPIM
Datum:
Mit, 2018-05-30 14:30 - 15:30
Location:
MPIM Lecture Hall
Parent event:
Number theory lunch seminar

Given two semistable elliptic surfaces over a smooth, projective curve $C$ defined over a field of characteristic zero or finitely generated over its prime field,  we show that any compatible family of effective isometries of the N{\'e}ron-Severi lattices of the base changed elliptic surfaces for all finite separable maps $B\to C$ arises from
an isomorphism of the elliptic surfaces. Without the effectivity hypothesis, we show that the two elliptic surfaces are isomorphic.

## On a universal Torelli theorem for elliptic surfaces

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Datum:
Mit, 2018-05-30 14:30 - 15:30
Parent event:
MPI-Oberseminar

Given two semistable elliptic surfaces over a smooth, projective curve $C$ defined over a field of characteristic zero or finitely generated over its prime field,  we show that any compatible family of effective isometries of the N{\'e}ron-Severi lattices of the base changed elliptic surfaces for all finite separable maps $B\to C$ arises from
an isomorphism of the elliptic surfaces. Without the effectivity hypothesis, we show that the two elliptic surfaces are isomorphic.

## On a non-abelian analogue of the Polya-Vinogradov inequality

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Speaker:
C. S. Rajan
Zugehörigkeit:
TIFR/MPIM
Datum:
Mit, 2018-05-30 16:30 - 17:30
Location:
MPIM Lecture Hall
Parent event:
Number theory lunch seminar

We consider an analogue of the classical Polya-Vinogradov inequality for character sums in
the context of the group GL(2) over finite fields. This is joint work with Satadal Ganguly.

## The Hopf-invariant one problem and applications

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Speaker:
Danica Kosanovic
Zugehörigkeit:
IMPRS MPIM
Datum:
Mit, 2018-05-30 16:30 - 18:00
Location:
MPIM Seminar Room
Parent event:
IMPRS seminar on K-theory
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