On a relation of overconvergence and $F$-analyticity on $p$-adic Galois representations of a $p$-adic field $F$

TL;DR

This paper explores the relationship between overconvergence and $F$-analyticity in $p$-adic Galois representations, showing that overconvergent representations are often $F$-analytic after a character twist, highlighting the importance of $(, abla)$-modules.

Contribution

It demonstrates that many overconvergent $p$-adic Galois representations become $F$-analytic after a twist, advancing understanding of their structure and the role of multivariable Robba rings.

Findings

Overconvergent representations are often $F$-analytic after a twist.

Highlights the importance of $(, abla)$-modules over multivariable Robba rings.

Supports the study of all $p$-adic Galois representations through this framework.

Abstract

Let $p$ be a prime number. There are properties called ``overconvergence'' and ``$F$-analyticity'' for $p$-adic Galois representations of a $p$-adic field $F$. By Berger's work, it is known that $F$-analyticity is stricter than overconvergence. In this article, we show that, in many cases, an overconvergent Galois representation is $F$-analytic up to a twist by a character. This result emphasizes the necessity of the theory of $(\varphi,\Gamma)$-modules over the multivariable Robba ring, by which we expect to study all $p$-adic Galois representations.