Arboreal Galois representations and uniformization of polynomial dynamics

Details Arboreal Galois representations and uniformization of polynomial dynamics Arboreal Galois representations and uniformization of polynomial dynamics

2011-11-15

arxiv.org/abs/1111.3607v1

Mathematics

Number Theory

Scientific paper

Given a polynomial f of degree d defined over a complete local field, we construct a biholomorphic change of variables defined in a neighbourhood of infinity which transforms the action z->f(z) to the multiplicative action z->z^d. The relation between this construction and the Bottcher coordinate in complex polynomial dynamics is similar to the relation between the complex uniformization of elliptic curves, and Tate's p-adic uniformization. Specifically, this biholomorphism is Galois equivariant, reducing certain questions about the Galois theory of preimages by f to questions about multiplicative Kummer theory.

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