Analysis & Applied Math

Event Information Semiclassical approximation and critical temperature shift for weakly interacting trapped bosons
13:10 on Friday March 12, 2021
14:00 on Friday March 12, 2021
Andreas Deuchert
ETH Zuerich

We consider a system of N trapped bosons with repulsive interactions in a combined semiclassical mean-field limit at positive temperature. We show that the free energy is well approximated by the minimum of the Hartree free energy functional - a natural extension of the Hartree energy functional to positive temperatures. The Hartree free energy functional converges in the same limit to a semiclassical free energy functional, and we show that the system displays Bose-Einstein condensation if and only if it occurs in the semiclassical free energy functional. This allows us to show that for weak coupling the critical temperature decreases due to the repulsive interactions. This is joint work with Robert Seiringer.

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