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Mathematical Physics

This series consists of talks in the area of Mathematical Physics.

Seminar Series Events/Videos

Currently there are no upcoming talks in this series.

 

Thursday May 26, 2016

Physically, there's no reason to expect that the A model (as encoded by Gromov-Witten invariants and the Fukaya category) should be related to the theory of cobordisms between D branes. However, it seems that for the A model on convex symplectic targets, the theory of Lagrangian cobordisms detects many invariants of the Fukaya category, and may even recover it--put another way, it seems one can enrich the algebraic structures of the A model as being linear over cobordism spectra.

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Thursday May 19, 2016
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We'll explain the slogan of the title: a cluster variety is a space associated to a quiver, and which is built out of algebraic tori.

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Tuesday Apr 05, 2016
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I will explain how to axiomatize the notion of a chiral WZW model using the formalism of VOAs (vertex operator algebras). This class of models is in almost bijective correspondence with pairs (G,k), where G is a connected (not necessarily simply connected) Lie group and k in H^4(BG,Z) is a degree four cohomology class subject to a certain positivity condition. To my surprise, I have found a couple extra models which satisfy all the defining properties of chiral WZW models, but which don't come from pairs (G,k) as above.

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Thursday Mar 17, 2016
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Thursday Mar 10, 2016
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Thursday Mar 03, 2016
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Thursday Feb 11, 2016
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This is a joint work with A.Kuznetsov and L.Rybnikov.

We study a moduli problem on a nodal curve of arithmetic genus 1, whose solution is an open subscheme in the zastava space for projective line. This moduli space is equipped with a natural Poisson structure, and we compute it in a natural coordinate system. We compare this Poisson structure with the trigonometric Poisson structure on the transversal slices in an affine flag variety.

We conjecture that certain generalized minors give rise to a cluster structure on the trigonometric zastava.

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Thursday Jan 28, 2016
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We will discuss a (conjectural) explicit presentation for the equivariant cohomology of Nakajima quiver varieties of type ADE. This presentation arises as a shadow of the expected symplectic duality between slices to Schubert varieties in the affine Grassmannian and Nakajima quiver varieties (a.k.a. the expected Coulomb and Higgs branches for a quiver gauge theory).

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Thursday Jan 21, 2016
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Categorical symplectic geometry studies an invariant of symplectic manifolds called the "Fukaya (A-infinity) category", which consists of the Lagrangian submanifolds and a symplectically-robust intersection theory of these Lagrangians.  Over the last two decades the Fukaya category has emerged as a powerful tool: for instance, it has produced inroads to Arnol'd's Nearby Lagrangians Conjecture, and it allowed Kontsevich to formulate the the Homological Mirror Symmetry conjecture.

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Thursday Jan 07, 2016

Let $S$ be a surface, $G$ a semi-simple group of type B, C or D. I will explain why the moduli space of framed local systems $A_{G,S}$ defined by Fock and Goncharov has the structure of a cluster variety, and fits inside a larger structure called a cluster ensemble. This was previously known only in type A. This gives a more direct proof of results of Fock and Goncharov for the symplectic and spin groups, and also allows one to quantize higher Teichmuller space in these cases.

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