Arithmetic Restrictions on Geometric Monodromy

Daniel Litt

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arXiv · 1607.05740

Arithmetic Restrictions on Geometric Monodromy

Daniel Litt

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Abstract

Let X be a normal complex algebraic variety, and p a prime. We show that there exists an integer N=N(X, p) such that: any non-trivial, irreducible representation of the fundamental group of X, which arises from geometry, must be non-trivial mod p^N. The proof involves an analysis of the action of the Galois group of a finitely generated field on the etale fundamental group of X. We also prove many arithmetic statements about fundamental groups which are of independent interest, and give several applications.

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Daniel Litt. 2016-07-19. Arithmetic Restrictions on Geometric Monodromy. https://arxiv.org/abs/1607.05740

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