Vanishing bulk viscosities and conformal invariance of unitary Fermi gas

Details Vanishing bulk viscosities and conformal invariance of unitary Fermi gas Vanishing bulk viscosities and conformal invariance of unitary Fermi gas

2005-11-30

arxiv.org/abs/cond-mat/0511721v2

Phys.Rev.Lett. 98 (2007) 020604

Physics

Condensed Matter

Other Condensed Matter

4 pages

Scientific paper

10.1103/PhysRevLett.98.020604

By requiring general-coordinate and conformal invariance of the hydrodynamic
equations, we show that the unitary Fermi gas has zero bulk viscosity, zeta=0,
in the normal phase. In the superfluid phase, two of the bulks viscosities have
to vanish, zeta_1=zeta_2=0, while the third one zeta_3 is allowed to be
nonzero.

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