Damping of low-energy excitations of a Bose-condensed gas in the hydrodynamic regime
P. O. Fedichev, A. E. Muryshev, and G. V. Shlyapnikov
TL;DR
This paper develops a theoretical framework to understand how low-energy excitations in a Bose-condensed gas are damped in the hydrodynamic regime, focusing on second sound and trapped condensate excitations.
Contribution
It introduces a new theory describing damping mechanisms of elementary excitations in Bose-condensed gases within the hydrodynamic regime.
Findings
Damping of second sound in a homogeneous Bose gas
Damping of lowest excitations in a trapped condensate
Theoretical predictions for excitation lifetimes
Abstract
We develop a theory to describe the damping of elementary excitations of a Bose-condensed gas in the hydrodynamic regime for the thermal cloud. We discuss second sound in a spatially homogeneous gas and the lowest excitations of a trapped condensate.
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Taxonomy
TopicsCold Atom Physics and Bose-Einstein Condensates · Quantum, superfluid, helium dynamics · Strong Light-Matter Interactions