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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.