Good-reduction conjecture for polarized morphisms

Let kk be any complete non-Archimedean field, and let XX be a projective kk-variety. A morphism f ⁣:XXf\colon X\to X is polarized if there exists an ample line bundle LXL\to X and an integer q2q\ge 2 such that fLf^*L is linearly equivalent to LqL^{\otimes q}. The morphism ff has good reduction if it extends to a regular self-map of a suitable flat projective model of XX over the valuation ring of kk. Good-reduction conjecture. If f ⁣:XXf\colon X\to X is polarized and htop(f)=0\operatorname{h_{top}}(f)=0, then ff has good reduction. This asks whether, within the polarized setting, vanishing topological entropy forces good reduction. The surrounding discussion explains that the analogous assertion fails for general regular self-maps in higher dimensions, while the polarized case is proposed as the relevant positive statement.

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Primary source

Charles Favre, Tuyen Trung Truong and Junyi Xie, “Topological entropy of a rational map over a complete metrized field”, arXiv:2208.00668 (2022).

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