Existence of an algebraically stable ramified model for maps with large dynamical degree

Let \f:P2P2\f: \mathbb{P}^2 \dashrightarrow \mathbb{P}^2 be a rational map of topological degree ee, and let λ1=limndeg(\fn)1/n\lambda_1=\lim_{n\to\infty}\operatorname{deg}(\f^n)^{1/n} be its first dynamical degree. A rational map is algebraically stable (AS) if k0\fkI(\f)\bigcup_{k\geq 0}\f^{-k}I(\f) is a countable union of points, where I(\f)I(\f) is its indeterminacy set. The ramified-model conjecture. If

e2<λ1,e^2<\lambda_1,

then there exist a birational model X\overline{X} of P2\mathbb{P}^2 and a ramified covering h:XXh:X\to\overline{X} such that \f\f lifts to XX and becomes AS. The conjecture proposes an algebraically stable realization after passing to a ramified cover, in a regime where the dynamical degree dominates the square of the topological degree; the supplied text gives no resolution evidence.

Sources & referencesView supporting material

Primary source

C. Favre, “Les applications monomiales en deux dimensions”, arXiv:math/0210025 (2002).

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