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Visco-elastic spectra of a dilute Bose fluid

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arxiv cond-mat/9809293 v1 pith:CPV5GUPY submitted 1998-09-22 cond-mat.stat-mech

Visco-elastic spectra of a dilute Bose fluid

classification cond-mat.stat-mech
keywords spectravisco-elasticapproximationasidebeyondbogolubovbosebose-condensed
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A recently developed local-density current functional formalism for confined Bose-condensed superfluids requires visco-elastic spectra which are defined through a finite-frequency extension of the dissipative coefficients entering the linearized hydrodynamic equations of the two-fluid model. We evaluate these spectra for a superfluid with contact interactions in the collisionless regime at finite temperature, by working to first order beyond the Bogolubov approximation. We find that within this approximation all the visco-elastic spectra take the same value aside from simple multiplicative factors.

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