Thursday, December 12, 2019 — 1:00 PM EST

Title: Graph covers with two new eigenvalues

Speaker: Olha Silina
Affiliation: University of Waterloo
Room: MC 5479

Abstract:

I am going to talk about graph covers. If $Y$ is a cyclic cover of $X$, it turns out that $Y$ has the same spectrum as $X$ plus (possibly) some new eigenvalues. 

Thursday, December 12, 2019 — 3:00 PM EST

Title: OutFn, M_gn and renormalized topological field theory

Speaker: Michael Borinsky
Affiliation: Nikhef
Room: MC 5417

Abstract:

I will report on recent joint work with Karen Vogtmann on the Euler characteristic of Out(F_n) and the moduli space of graphs.

Friday, January 31, 2020 — 3:30 PM EST

Title: Permanent Hardness from Linear Optics

Speaker: Daniel Grier
Affiliation: University of Waterloo
Room: MC 5501

Abstract:

One of the great accomplishments in complexity theory was Valiant's 1979 proof that the permanent of a matrix is #P-hard to compute.  Subsequent work simplified Valiant's ideas and even began to recast them as problems in quantum computing. 

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