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Variations on a Theorem of Tate

About this Title

Stefan Patrikis, Princeton University, Department of Mathematics, Fine Hall, Washington Road, Princeton, NJ 08544

Publication: Memoirs of the American Mathematical Society
Publication Year: 2019; Volume 258, Number 1238
ISBNs: 978-1-4704-3540-0 (print); 978-1-4704-5067-0 (online)
DOI: https://doi.org/10.1090/memo/1238
Published electronically: February 7, 2019
Keywords: Galois representations, algebraic automorphic representations, motives for motivated cycles, monodromy, Kuga-Satake construction, hyperkähler varieties
MSC: Primary 11R39, 11F80, 14C15

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Table of Contents

Chapters

  • 1. Introduction
  • 2. Foundations & examples
  • 3. Galois and automorphic lifting
  • 4. Motivic lifting

Abstract

Let $F$ be a number field. These notes explore Galois-theoretic, automorphic, and motivic analogues and refinements of Tate’s basic result that continuous projective representations $\mathrm {Gal}(\bar {F}/F) \to \mathrm {PGL}_n(\mathbb {C})$ lift to $\mathrm {GL}_n(\mathbb {C})$. We take special interest in the interaction of this result with algebraicity (for automorphic representations) and geometricity (in the sense of Fontaine-Mazur). On the motivic side, we study refinements and generalizations of the classical Kuga-Satake construction. Some auxiliary results touch on: possible infinity-types of algebraic automorphic representations; comparison of the automorphic and Galois “Tannakian formalisms”; monodromy (independence-of-$\ell$) questions for abstract Galois representations.

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