Derivation of 3D energy-critical nonlinear Schrödinger equation and Bogoliubov excitations for Bose gases

Abstract

We derive the 3D quintic NLS as the mean field limit of a Bose gas with three-body interactions. The quintic NLS is energy-critical, leading to several new difficulties in comparison with the cubic NLS which emerges from Bose gases with pair-interactions. Our method is based on Bogoliubov's approximation, which also provides the information on the fluctuations around the condensate in terms of a norm approximation for the N-body wave function.

66 pages, final version to appear in Commun. Math. Phys