Comparing Homological Invariants for Mapping Classes of Surfaces

Abstract

We compare two different types of mapping class invariants: the Hochschild homology of an A∞ bimodule coming from bordered Heegaard Floer homology and fixed point Floer cohomology. We first compute the bimodule invariants and their Hochschild homology in the genus two case. We then compare the resulting computations to fixed point Floer cohomology and make a conjecture that the two invariants are isomorphic. We also discuss a construction of a map potentially giving the isomorphism. It comes as an open-closed map in the context of a surface viewed as a 0-dimensional Lefschetz fibration over the complex plane.