Article,

Nonperturbative Predictions for Cold Atom Bose Gases with Tunable Interactions

, , , , and .
Physical Review Letters, 105 (24): 240402+ (December 2010)
DOI: 10.1103/physrevlett.105.240402

Abstract

We derive a theoretical description for dilute Bose gases as a loop expansion in terms of composite-field propagators by rewriting the Lagrangian in terms of auxiliary fields related to the normal and anomalous densities. We demonstrate that already in leading order this nonperturbative approach describes a large interval of coupling-constant values, satisfies Goldstone's theorem, yields a Bose-Einstein transition that is second order, and is consistent with the critical temperature predicted in the weak-coupling limit by the next-to-leading-order large-N expansion.

Tags

Users

  • @jaspervh

Comments and Reviews