Diamantine Picard functors of rigid spaces

Abstract

For a connected smooth proper rigid space $X$ over a perfectoid field extension of ${\mathbb{Q}}_p$, we show that the étale Picard functor of $X$ defined on perfectoid test objects is the diamondification of the rigid analytic Picard functor. In particular, it is represented by a rigid analytic group variety if and only if the rigid analytic Picard functor is. Second, we study the $v$-Picard functor that parametrises line bundles in the finer $v$-topology on the diamond associated to $X$ and relate this to the rigid analytic Picard functor by a geometrisation of the multiplicative Hodge--Tate sequence. The motivation is an application to the $p$-adic Simpson correspondence, namely our results pave the way towards the first instance of a new moduli theoretic perspective.

v4: This is the accepted version. v3: Sections 4,5 of v1 now part of arxiv:2207.13657