On the structure of some $p$-adic period domains

Abstract

We prove the Fargues-Rapoport conjecture for p-adic period domains: for a reductive group G over a p-adic field and a minuscule cocharacter {\mu} of G, the weakly admissible locus coincides with the admissible one if and only if the Kottwitz set B(G,{\mu}) is fully Hodge-Newton decomposable.