The excitation spectrum of Bose gases interacting through singular potentials

Abstract

We consider systems of $N$ bosons in a box with volume one, interacting through a repulsive two-body potential of the form $κN^{3β-1} V(N^βx)$. For all $0 < β< 1$, and for sufficiently small coupling constant $κ> 0$, we establish the validity of Bogoliubov theory, identifying the ground state energy and the low-lying excitation spectrum up to errors that vanish in the limit of large $N$.

78 pages. arXiv admin note: text overlap with arXiv:1703.04452