Elliptic flow and nearly perfect fluidity in dilute Fermi gases

Details Elliptic flow and nearly perfect fluidity in dilute Fermi gases Elliptic flow and nearly perfect fluidity in dilute Fermi gases

2010-12-16

arxiv.org/abs/1012.3718v1

Physics

Nuclear Physics

Nuclear Theory

6 pages, to appear in the proceedings of "Quark Confinement and the Hadron Spectrum IX", August 30 - September 3, 2010, Madrid

Scientific paper

In this contribution we summarize recent progress in understanding the shear viscosity of strongly correlated dilute Fermi gases. We discuss predictions from kinetic theory, and show how these predictions can be tested using recent experimental data on elliptic flow. We find agreement between theory and experiments in the high temperature regime $T\gg T_F$, where $T_F$ is the the temperature where quantum degeneracy effects become important. In the low temperature regime, $T\sim T_F$, the strongest constraints on the shear viscosity come from experimental studies of the damping of collective modes. These experiments indicate that $\eta/s\lsim 0.5\hbar/k_B$, where $\eta$ is the shear viscosity and $s$ is the entropy density.

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