Converse to derived isogeny implying quasi-liftable isogeny for abelian surfaces

Let XX and YY be abelian surfaces over kˉ\bar{k} with finite height and char(k)2\operatorname{char}(k)\neq 2. They are quasi-liftably isogenous if they are isogenous through suitable liftings to characteristic zero. Converse conjecture. If XX and YY are quasi-liftable isogenous, then they are derived isogenous; equivalently, under these assumptions, XX and YY are derived isogenous if and only if they are quasi-liftable isogenous.

The forward implication is established in the cited theorem, and the authors state that they believe the converse also holds. Thus the converse remains open.

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Primary source

Zhiyuan Li and Haitao Zou, “Derived isogenies and isogenies for abelian surfaces”, arXiv:2108.08710 (2025).

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