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Topos Theory

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Speaker: 
David Carchedi
Date: 
Wed, 2013-04-17 16:15 - 18:00
Location: 
MPIM Seminar Room
Parent event: 
Master's Course on Topos Theory

Boundary conditions for 3d TQFTs and module categories

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Speaker: 
Alessandro Valentino
Affiliation: 
Hamburg
Date: 
Wed, 2013-04-17 10:30 - 12:00
Location: 
MPIM Lecture Hall
Parent event: 
Higher Differential Geometry Seminar

In this talk I will discuss some aspects of boundary conditions for a 3d TFT of Reshetikhin-Turaev type, and their description in terms of module categories.

K3 Surfaces of High Picard Rank

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Speaker: 
Adiran Clingher
Affiliation: 
U of Missouri - St. Louis/MPI
Date: 
Tue, 2013-04-16 15:00 - 15:50
Location: 
MPIM Lecture Hall
Parent event: 
Seminar on Algebra, Geometry and Physics

The talk will focus on a special class of complex algebraic K3 surfaces of Picard rank 16 or higher. I will discuss a classification of these objects in terms of modular forms of appropriate type.

Topology, rigid cosymmetries and linearization instability in higher gauge theories

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Speaker: 
Igor Khavkine
Affiliation: 
Inst. for Theoretical Physics, Utrecht U
Date: 
Tue, 2013-04-16 14:00 - 14:50
Location: 
MPIM Lecture Hall
Parent event: 
Seminar on Algebra, Geometry and Physics

We consider a class of non-linear PDE systems, whose equations possess Noether identities (the equations are redundant), including non-variational systems (not coming from Lagrangian field theories), where Noether identities and infinitesimal gauge transformations need not be in bijection. We also include theories with higher stage Noether identities, known as higher gauge theories (if they are variational).

Stability Conditions on K3 surfaces (after Bridgeland)

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Speaker: 
Nicolo Sibilla
Affiliation: 
MPI
Date: 
Mon, 2013-04-15 16:15 - 17:45
Location: 
MPIM Seminar Room
Parent event: 
Derived categories of coherent sheaves

Equivariant Morse theory

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Speaker: 
J. Loeffler
Date: 
Mon, 2013-04-15 14:15 - 15:45
Location: 
MPIM Seminar Room
Parent event: 
IMPRS-seminar on moduli of G-bundles

The birth of DST: Bing's 1952 exotic involution of the 3-sphere

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Speaker: 
R. Edwards
Date: 
Mon, 2013-04-15 12:00 - 13:30
Location: 
MPIM Lecture Hall
Parent event: 
IMPRS Minicourse
Parent event: 
Lecture Series on Bing topology and Casson handles
Video: 
video/mp4 icon20130415_edwards1a.mp4
video/mp4 icon20130415_edwards1b.mp4

Pi_1 negligible embeddings in 4-manifolds, and applications

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Speaker: 
Frank Quinn
Date: 
Fri, 2013-04-12 10:30 - 12:00
Location: 
MPIM Lecture Hall
Parent event: 
Classification of Topological 4-manifolds (Semester on 4-manifolds)
Parent event: 
Lecture Series on 4-manifolds

http://people.mpim-bonn.mpg.de/teichner/Math/4-Manifolds.html

Habilitationsvortrag

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Speaker: 
Thomas Vogel
Affiliation: 
MPI
Date: 
Thu, 2013-04-11 16:30 - 17:30
Location: 
MPIM Lecture Hall
Details: 
Program and Abstracts of Habilitationsvortrag

Uniqueness of the contact structure approximating a foliation

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Speaker: 
Thomas Vogel
Affiliation: 
MPI
Date: 
Thu, 2013-04-11 16:30 - 17:30
Location: 
MPIM Lecture Hall
Parent event: 
Oberseminar Differentialgeometrie

According to a theorem of Eliashberg and Thurston a C2-foliation on a closed 3-manifold can be C0-approximated by contact structures unless all leaves of the foliation are spheres. Examples on the 3-torus show that every neighbourhood of  a foliation can contain
infinitely many non-diffeomorphic contact structures. In this talk we show that this is rather exceptional: In many interesting situations the contact structure in a sufficiently small

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