On the Semi-Stable CoHa and its Modules Arising from Smooth Models

Abstract

We study a variant of the semi-stable Cohomological Hall algebra which we construct using equivariant Chow groups. This algebra, we call it the semi-stable ChowHa, arises as a quotient of the CoHa. Smooth models of quiver moduli give rise to modules over the semi-stable ChowHa. We prove that these modules are cyclic and we compute a presentation using Harder-Narasimhan methods.

arXiv comment20 pages, comments welcome; v2: minor edits, references added; v3: Co. 4.4 deserved some explanation, further minor edits