Chow Rings of Moduli Spaces of Pointed Hyperelliptic Curves
In this talk, I'll describe the geometry of the moduli space Hg,n of n-pointed, genus g hyperelliptic curves. As n grows relative to g, work of Casnati and Schwarz shows that Hg,n goes from being rational (the simplest kind of variety) to general type (quite complicated). This suggests that we have hope of probing finer invariants of Hg,n when n is small relative to g. The Chow ring of Hg,n is one such invariant. I will describe an inductive procedure for stratifying Hg,n into nice pieces, which allows us to calculate its rational Chow ring when n≤2g+6. This is joint work with Samir Canning.