Projective varieties with bad reduction at 3 only

TL;DR

This paper develops an integral theory for p-adic semi-stable Galois representations with specific Hodge-Tate weights, leading to a new criterion relating Hodge numbers of certain algebraic varieties with bad reduction only at 3.

Contribution

It introduces a modified Breuil theory for p-adic semi-stable representations with weights in [0,p), enabling new insights into varieties with controlled bad reduction.

Findings

Established a relation h^2(Y_C)=h^{1,1}(Y_C) for varieties with bad reduction only at 3.

Constructed an integral theory for p-adic semi-stable representations with specific Hodge-Tate weights.

Applied the theory to a Shafarevich-type conjecture for algebraic varieties.

Abstract

Suppose F=W(k)[1/p] where W(k) is the ring of Witt vectors with coefficients in algebraically closed field k of characteristic p>2. We construct integral theory of p-adic semi-stable representations of the absolute Galois group of F with Hodge-Tate weights from [0,p). This modification of Breuil's theory results in the following application in the spirit of Shafarevich's Conjecture. If Y is a projective algebraic variety over the field of rational numbers with good reduction modulo all primes different from 3 and semi-stable reduction modulo 3 then for the Hodge numbers of the complexification Y_C of Y, it holds h^2(Y_C)=h^{1,1}(Y_C).