Deformation rings and parabolic induction

Abstract

We study deformations of smooth mod $p$ representations (and their duals) of a $p$-adic reductive group $G$. Under some mild genericity condition, we prove that parabolic induction with respect to a parabolic subgroup $P=LN$ defines an isomorphism between the universal deformation rings of a supersingular representation $\bar{\sigma }$ of $L$ and of its parabolic induction $\bar{\pi }$. As a consequence, we show that every Banach lift of $\bar{\pi }$ is induced from a unique Banach lift of $\bar{\sigma }$.

28 pages, minor changes, final version