$0$-cycles and sheaves on abelian surfaces

We introduce a filtration on the Chow ring of an abelian surface $A$, inspired by O’Grady’s filtration on K3 surfaces. We give a geometric description of the filtration, and we prove that it is deeply linked with the rational orbit of points in the generalized Kummer variety of $A$. We propose a conjecture on the second Chern class of sheaves on this abelian surface, and we provide some evidence for the conjecture and prove some of its applications.