Monday,
20111031
16:15

Raum 404, Eckerstr. 1
Victor Bangert:
(Non)Integrability of calibrated kplane fields 
Monday,
20111107
16:15

Raum 404, Eckerstr. 1
Blaz Mramor (Vrije Universiteit Amsterdam):
Destruction of minimal foliations for finite range FrenkelKontorova models
Vortrag im Rahmen des SFB/Transregio 71
Monotone variational recurrence relations such as the Frenkel
Kontorova lattice, arise in solid state physics and as Hamiltonian
twist maps. AubryMather theory guarantees the existence of minimizers
of every rotation number. They constitute the AubryMather set. When
the rotation number is irrational, the AubryMather set is either
connected  a foliation, or a Cantor set  a lamination. It turns out
that when the rotation number of a minimal foliation is Liouville
(easy to approximate by rational numbers) the foliation can be
destroyed into a lamination by an arbitrarily small smooth
perturbation of the recurrence relation. 
Monday,
20111121
16:00

Raum 404, Eckerstr. 1
Oliver Fabert:
Computing descendants in symplectic field theory
Symplectic field theory (SFT) assigns to each symplectomorphism (of a closed symplectic manifold) an infinitedimensional Hamiltonian system with an infinite number of symmetries. While the latter are obtained using descendants, for Hamiltonian symplectomorphisms this leads to the wellknown integrable hierarchies of GromovWitten theory. In joint work with P. Rossi we study the algebraic structure of descendants, both to find richer geometrical invariants and to answer the question of integrability for general symplectomorphisms. 
Monday,
20111205
16:15

Raum 404, Eckerstr. 1
Anda Degeratu:
Crepant resolutions of CalabiYau orbifolds
A CalabiYau orbifold in complex dimension 3 is locally modeled on C^3/G with G a finite subgroup of SL(3,C). When G acts with an isolated fixed point on C^3, a crepant resolution has the structure of an asymptotically locally euclidean (ALE) manifold. Using index theory techniques we derive a geometrical interpretation of the McKay correspondence which relates the geometry of the crepant resolution to the representation theory of the finite group G. This extends a result of Kronheimer and Nakajima to this higher dimensional case. 
Monday,
20111212
16:15

Raum 404, Eckerstr. 1
Alexander Alexandrov:
Matrix models, enumerative geometry and integrability
Some of generating functions in enumerative geometry are known to be related to matrix integrals and
classical integrable hierarchies of KP/Toda type. In recent years it become clear that the partition functions of the
this still not completely described set of models posses other nice properties such
as cutandjointype representations, random partition descriptions and Virasorotype constraints.
I will explain some of the aforementioned properties and relations between them for three important models, namely Hermitian matrix model,
KontsevichWitten taufunction and generating function of Hurwitz numbers. 
Monday,
20111219
16:15

Raum 404, Eckerstr. 1
Patrick Emmerich:
Rigidity of complete Riemannian cylinders without conjugate points 
Monday,
20120109
16:15

Raum 404, Eckerstr. 1
Magnus Engenhorst:
Quadratic Differentials and BPS states 
Monday,
20120116
16:1517:45

Raum 404, Eckerstr. 1
Dr. Emanuel Scheidegger:
Counting curves on CalabiYau manifolds
We give an overview on GromovWitten theory of CalabiYau manifolds. In particular, we study generating functions of GromovWitten invariants and explain their reformulations by physicists. Our focus will lie on those cases for which these functions turn out or are expected to be modular forms. 
Monday,
20120123
16:15

Raum 404, Eckerstr. 1
Anda Degeratu:
Invariants of elliptically fibered CalabiYau 3folds
We look at a special type of elliptically fibered CalabiYau 3folds arising via the heterotic/Ftheory stringstring duality. We describe the imprint of this duality on the geometry and topology of the CalabiYaus. This is joint work with Katrin Wendland. 
Monday,
20120206
16:15

Raum 404, Eckerstr. 1
Nadja Fischer, Anja Fuchshuber:
The Family Index Theorem and the EtaForm
We'll give an overview of the index theorem in different situations and then we'll concentrate on families of closed manifolds. We are interested in the etaform and its convergence at infinity and zero.
Our presentation will be based on "Heat Kernels and Dirac Operators" by Berline, Getzler and Vergne. 
Monday,
20120213
16:15

Raum 404, Eckerstr. 1
Natalie Peternell:
Kozykel für charakteristische Klassen
In meinem Vortrag konstruiere ich nach BrylinskiMc Laughlin Kozykeldarstellungen für charakteristische Klassen in der glatten DeligneKohomologie. 