Twisted derived equivalences and isogenies for abelian surfaces

In this paper, we study the twisted Fourier-Mukai partners of abelian surfaces. Following the work of Huybrechts [doi:10.4171/CMH/465], we introduce the twisted derived equivalence between abelian surfaces. We show that there is a twisted derived Torelli theorem for abelian surfaces over fields with characteristic $\neq 2$. Over complex numbers, twisted derived equivalence corresponds to rational Hodge isometries between the second cohomology groups, which is in analogy to the work of Huybrechts and Fu-Vial on K3 surfaces. Their proof relies on the global Torelli theorem over $\mathbb{C}$, which is missing in positive characteristics. To overcome this issue, we extend Shioda's trick on singular cohomology groups to etale and crystalline cohomology groups and make use of Tate's isogeny theorem to give a characterization of twisted derived equivalence on abelian surfaces via using so called principal quasi-isogeny.