Bose--Einstein condensation for particles with repulsive short-range pair interactions in a Poisson random external potential in ${\mathbb{R}}^d$

Abstract

We study Bose gases in $d$ dimensions, $d\ge 2$, with short-range repulsive pair interactions, at positive temperature, in the canonical ensemble and in the thermodynamic limit. We assume the presence of hard Poissonian obstacles and focus on the non-percolation regime. For sufficiently strong interparticle interactions, we show that almost surely there cannot be Bose--Einstein condensation into a sufficiently localized, normalized one-particle state. The results apply to the eigenstates of the underlying one-particle Hamiltonian.