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Updated: Jun 5, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
Nonperturbative predictions for cold atom bose gases with tunable interactions
Fred Cooper1, Chih-Chun Chien, Bogdan Mihaila
1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
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.
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