Semistable reduction conjecture for abelian varieties and dynamical systems

Let KK be a complete discretely valued field. An extension L/KL/K is weakly totally ramified if it is separable and has the relevant ramification property while preserving the residue field. Let A/KA_{/K} be an abelian variety, and let f ⁣:\PPKn\PPKnf\colon \PP^n_K\to\PP^n_K be a dynamical system of degree d2d\geq 2. Semistable reduction conjecture. There is a separable weakly totally ramified extension L/KL/K and a model for ALA_L that admits semistable reduction; likewise, there is such an extension L/KL/K and a model for fLf_L that admits semistable reduction. The preceding discussion explains that Ramified Approximation provides this kind of result for elliptic curves and dynamical systems on \PPK1\PP^1_K, while extensions to general abelian varieties and dynamical systems on higher-dimensional projective space are unclear; the quasi-finite residue-field case offers some partial motivation but does not establish the assertions.

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Primary source

Xander Faber, “Ramified Approximation and Semistable Reduction”, arXiv:2407.12089 (2025).

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