The temperature evolution of the shear viscosity in a unitary Fermi gas

Abstract

We present an ab initio determination of the shear viscosity for the unitary Fermi gas based on finite temperature quantum Monte Carlo (QMC) calculations and the Kubo linear-response formalism. The results are confronted with the bound for the shear viscosity originating from hydrodynamic fluctuations. Assuming smoothness of the frequency dependent shear viscosity eta(omega), we show that the bound is violated in the low temperature regime and the violation occurs simultaneously with the onset of the Cooper paring in the system. In order to preserve the hydrodynamic bound in QMC eta(omega) has to possess a sharp structure located in the vicinity of zero frequency which is not resolved by an analytic continuation procedure.

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• Shear viscosity of a universal Fermi gas near the superfluid phase transition
• Fluid Dynamics and Viscosity in Strongly Correlated Fluids
• Anomalous minimum in the shear viscosity of a Fermi gas
• High-temperature expansion of the viscosity in interacting quantum gases
• Life Cycle of Superfluid Vortices and Quantum Turbulence in the Unitary Fermi Gas
• Hydrodynamic tails and a fluctuation bound on the bulk viscosity
• Determination of the density and temperature dependence of the shear viscosity of a unitary Fermi gas based on hydrodynamic flow
• Perfect-fluid behavior of a dilute Fermi gas near unitary
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• Shear viscosity and Strong-Coupling Corrections in the BCS-BEC crossover Regime of an Ultracold Fermi Gas
• Second sound with ultracold atoms: A brief historical account
• Shear viscosity of strongly interacting fermionic quantum fluids
• Sensitivity to the initial conditions of the Time-Dependent Density Functional Theory
• Viscosity spectral function of a scale invariant non-relativistic fluid from holography
• Viscosity Bound Violation in Viscoelastic Fermi Liquids
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• Roundtable: What can we learn about confinement and anomalous effects in QCD using analog systems?