Phys. Rev. Lett. 98, 020604 (2007) [4 pages]Vanishing Bulk Viscosities and Conformal Invariance of the Unitary Fermi GasReceived 24 January 2006; published 11 January 2007 By requiring general-coordinate and conformal invariance of the hydrodynamic equations, we show that the unitary Fermi gas has zero bulk viscosity, ζ=0, in the normal phase. In the superfluid phase, two of the bulk viscosities have to vanish, ζ1=ζ2=0, while the third one ζ3 is allowed to be nonzero. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.020604
DOI:
10.1103/PhysRevLett.98.020604
PACS:
05.60.Gg, 03.75.Ss, 05.30.Fk
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