Past

There is a construction, due to Kontsevich, which produces cohomology classes in moduli spaces of Riemann surfaces from the initial data of an A-infinity algebra with an invariant inner product -- a kind of homotopy theoretic notion of a Frobenius algebra.

In this talk I will describe a version of this construction based on noncommutative symplectic geometry and use it to show that homotopy equivalent A-infinity algebras give rise to cohomologous classes. I will explain how the whole framework can be adapted to deal with Topological Conformal Field Theories in the sense of Costello, Kontsevich and Segal.

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In Dept of Statistics

http://www.maths.ox.ac.uk/arg

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In the first part of the talk I will discuss existence and regularity results for models of complex non-Newtonian fluids containing liquid crystalline polymers. The main technical tool is related to an apriori logarithmic estimate for the 2D Navier-Stokes equations.

In the second part I will consider a simplified version of the system and describe some of its qualitative properties as well as the analytical challenges posed by its study.

The first part is joint work with P Constantin, Ch. Fefferman and E Titi.

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http://www.maths.ox.ac.uk/arg/