Algebraic dynamics of the lifts of Frobenius

We study the algbraic dynamics for endomorphisms of projective spaces with coefficients in a p-adic field whose reduction in positive characteritic is the Frobenius. In particular, we prove a version of the dynamical Manin-Mumford conjecture and the dynamical Mordell-Lang conjecture for the coherent backward orbits for such endomorphisms. We also give a new proof of a dynamical version of the Tate-Voloch conjecture in this case. Our method is based on the theory of perfectoid spaces introduced by P. Scholze. In the appendix, we prove that under some technical condition on the field of definition, a dynamical system for a polarized lift of Frobenius on a projective variety can be embedding into a dynamical system for some endomorphism of a projective space.Comment: 37 page

Intersection of valuation rings in k[x,y]k[x,y]

We associate to any given finite set of valuations on the polynomial ring in two variables over an algebraically closed field a numerical invariant whose positivity characterizes the case when the intersection of their valuation rings has maximal transcendence degree over the base fields. As an application, we give a criterion for when an analytic branch at infinity in the affine plane that is defined over a number field in a suitable sense is the branch of an algebraic curve

The existence of Zariski dense orbits for polynomial endomorphisms of the affine plane

In this paper we prove the following theorem. Let $f:\mathbb{A}^2\rightarrow \mathbb{A}^2$ be a dominate polynomial endomorphisms defined over an algebraically closed field $k$ of characteristic $0$. If there are no nonconstant rational function $g:\mathbb{A}^2-rightarrow \mathbb{P}^1$ satisfying $g\circ f=g$, then there exists a point $p\in \mathbb{A}^2(k)$ whose orbit under $f$ is Zariski dense in $\mathbb{A}^2$. This result gives us a positive answer to a conjecture of Amerik, Bogomolov and Rovinsky ( and Zhang) for polynomial endomorphisms on the affine plane.Comment: arXiv admin note: substantial text overlap with arXiv:1503.0077

Surjective endomorphisms of projective surfaces -- the existence of infinitely many dense orbits

Let $f \colon X \to X$ be a surjective endomorphism of a normal projective surface. When $\operatorname{deg} f \geq 2$, applying an (iteration of) $f$-equivariant minimal model program (EMMP), we determine the geometric structure of $X$. Using this, we extend the second author's result to singular surfaces to the extent that either $X$ has an $f$-invariant non-constant rational function, or $f$ has infinitely many Zariski-dense forward orbits; this result is also extended to Adelic topology (which is finer than Zariski topology)

The Geometric Bombieri-Lang Conjecture for Ramified Covers of Abelian Varieties

In this paper, we prove the geometric Bombieri-Lang conjecture for projective varieties which have finite morphisms to abelian varieties of trivial traces over function fields of characteristic 0. The proof is based on the idea of constructing entire curves in the pre-sequel "Partial heights, entire curves, and the geometric Bombieri-Lang conjecture." A new ingredient is an explicit description of the entire curves in terms of Lie algebras of abelian varieties.Comment: The original paper arXiv:2305.14789v1 is split into two papers: arXiv:2305.14789v2 and the current pape

Partial Heights and the Geometric Bombieri-Lang Conjecture

We prove the geometric Bombieri-Lang conjecture for projective varieties which have finite morphisms to abelian varieties over function fields of characteristic 0. Our proof is complex analytic, which applies the classical Brody lemma to construct entire curves on complex varieties. Our key ingredients includes a new notion of partial height and its non-degeneracy in a suitable sense. The non-degeneracy is required in the application of the Brody lemma.Comment: 61 page