Shear viscosity in a superfluid cold Fermi gas at unitarity

2012/01/19 by Massimo Mannarelli, Mannarelli, Massimo, Cristina Manuel +3
Physics and Astronomy · #Atomic and Subatomic Physics Research #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th) #Quantum Gases (cond-mat.quant-gas) #Quantum, superfluid, helium dynamics

paper · pdf · doi:10.48550/arxiv.1201.4006

openalex publication_date 2012/01/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We analyze the contributions of Nambu-Goldstone modes to the shear viscosity of a superfluid atomic Fermi gas close to unitarity. We show that the low temperature experimental values of the shear viscosity to entropy ratio, η/s, are reproduced considering an effective shear viscosity which takes into account the collisions among Nambu-Goldstone bosons and the finite size of the optical trap. We predict that, for T \lesssim 0.1 T_F, η/s should correlate with the size of the trap and linearly decrease with decreasing temperature. For T \gtrsim 0.1 T_F, we find agreement with the experimental data assuming that the Nambu-Goldstone modes have an anomalous dispersion law.

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