Phys. Rev. A 76, 063618 (2007) [5 pages]Ratio of shear viscosity to entropy density for trapped fermions in the unitarity limitReceived 26 January 2007; revised 14 September 2007; published 20 December 2007 We extract the shear viscosity to entropy density ratio η/s of cold fermionic atoms in the unitarity limit from experimental data on the damping of collective excitations. We find that near the critical temperature η/s is roughly equal to 1/2 in units of ℏ/kB. With the possible exception of the quark gluon plasma, this value is closer to the conjectured lower bound 1/(4π) than any other known liquid. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.76.063618
DOI:
10.1103/PhysRevA.76.063618
PACS:
03.75.Ss, 05.60.Gg, 67.57.Jj, 67.90.+z
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