Date: Monday, November 13, 2017
Location: 4096 East Hall (4:00 PM to 6:00 PM)
Title: Generalized boundary strata classes
Abstract: The DeligneMumford moduli space of stable curves of genus g admits a stratification by topological type. These boundary strata define classes in the Chow ring of the moduli space of stable curves. I will describe a natural generalization of these boundary strata classes to unstable topological types. I will then use the unstable boundary strata classes to define some interesting subrings of the Chow ring. In particular, there is a relatively small subring of the Chow ring that contains every double ramification cycle.
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Speaker: Aaron Pixton
Institution: MIT
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