We study the algebraic dynamics of endomorphisms of projective spaces with coefficients
in a
-adic
field whose reduction in positive characteristic 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 of 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 embedded into a dynamical system for some endomorphism of a projective
space.
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