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arxiv: cond-mat/0511721 · v2 · submitted 2005-11-30 · ❄️ cond-mat.other · cond-mat.supr-con· hep-ph· nucl-th

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Vanishing bulk viscosities and conformal invariance of unitary Fermi gas

D.T. Son
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classification ❄️ cond-mat.other cond-mat.supr-conhep-phnucl-th
keywords zetabulkconformalfermiinvariancephaseunitaryviscosities
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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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