Published online by Cambridge University Press: 25 June 2019
In this article we construct a p-adic three-dimensional eigenvariety for the group $U$(2,1)(
$E$), where
$E$ is a quadratic imaginary field and
$p$ is inert in
$E$. The eigenvariety parametrizes Hecke eigensystems on the space of overconvergent, locally analytic, cuspidal Picard modular forms of finite slope. The method generalized the one developed in Andreatta, Iovita and Stevens [
$p$-adic families of Siegel modular cuspforms Ann. of Math. (2) 181, (2015), 623–697] by interpolating the coherent automorphic sheaves when the ordinary locus is empty. As an application of this construction, we reprove a particular case of the Bloch–Kato conjecture for some Galois characters of
$E$, extending the results of Bellaiche and Chenevier to the case of a positive sign.