# Seminars & Events for Symplectic Geometry Seminar

##### BCFG Drinfeld-Sokolov hierarchies and ADE LG-model with symmetry

Please note special day (Monday), time and location. More than twenty years ago, Witten proposed a remarkable conjecture connecting the geometry of moduli space of curve or Gromov-Witten theory of point to KdV integrable hierarchies (solved by Kontsevich). PLEASE CLICK ON SEMINAR TITLE FOR COMPLETE ABSTRACT.

##### Virtual neighbourhood technique and its applications

PLEASE CLICK ON SEMINAR TITLE FOR COMPLETE ABSTRACT. In this talk, I will explain the recent joint work with Bohui Chen and Anmin Li on virtual neighborhood techniques for a Fredholm system (B, E, S), where E is a Banach vector bundle over a Banach manifold B with a Fredholm section.

##### Towards Viterbo functoriality for nonexact Liouville embeddings

I will outline a way to extend the construction of Viterbo's transfer map in symplectic homology to nonexact embeddings of one Liouville domain into another. The approach is motivated by SFT, but at least parts of it can be implemented independently.

##### Minimal Discrepancy of Isolated Singularities and Reeb Orbits

**Please note: two speakers on April 4. Let A be an affine variety inside a complex N dimensional vector space which either has an isolated singularity at the origin or is smooth at the origin. The intersection of A with a very small sphere turns out to be a contact manifold called the link of A. Any contact manifold contactomorphic to the link of A is said to be Milnor fillable by A. If the first Chern class of our link is 0 then we can assign an invariant of our singularity called the minimal discrepancy, which is an important invariant in birational geometry. We relate the minimal discrepancy with indices of certain Reeb orbits on our link. As a result we show that the standard contact 5 dimensional sphere has a unique Milnor filling up to normalization.**