Locally analytic vector bundles on the Fargues-Fontaine curve

TL;DR

This paper develops a theory connecting equivariant vector bundles on the Fargues-Fontaine curve with locally analytic vector bundles, providing new insights into $()\text{-}\Gamma$-modules and Galois representations through differential equations.

Contribution

It introduces a novel Sen theory framework for equivariant vector bundles, linking them to locally analytic bundles and Galois representations via differential equations.

Findings

Every equivariant vector bundle descends to a locally analytic vector bundle.

The theory recovers the Cherbonnier-Colmez decompletion theorem.

De Rham locally analytic vector bundles correspond to solutions of differential equations.

Abstract

In this article, we develop a version of Sen theory for equivariant vector bundles on the Fargues-Fontaine curve. We show that every equivariant vector bundle canonically descends to a locally analytic vector bundle. A comparison with the theory of $(\varphi,\Gamma)$-modules in the cyclotomic case then recovers the Cherbonnier-Colmez decompletion theorem. Next, we focus on the subcategory of de Rham locally analytic vector bundles. Using the p-adic monodromy theorem, we show that each locally analytic vector bundle $\mathcal{E}$ has a canonical differential equation for which the space of solutions has full rank. As a consequence, $\mathcal{E}$ and its sheaf of solutions $\mathrm{Sol}(\mathcal{E})$ are in a natural correspondence, which gives a geometric interpretation of a result of Berger on $(\varphi,\Gamma)$-modules. In particular, if $V$ is a de Rham Galois representation, its associated filtered $(\varphi,N,G_{K})$-module is realized as the space of global solutions to the differential equation. A key to our approach is a vanishing result for the higher locally analytic vectors of representations satisfying the Tate-Sen formalism, which is also of independent interest.