Bulk viscosity of strongly coupled plasmas with holographic duals

Steven S. Gubser, Silviu S. Pufu, Fábio D. Rocha

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112 Scopus citations


We explain a method for computing the bulk viscosity of strongly coupled thermal plasmas dual to supergravity backgrounds supported by one scalar field. Whereas earlier investigations required the computation of the leading dissipative term in the dispersion relation for sound waves, our method requires only the leading frequency dependence of an appropriate Green's function in the low-frequency limit. With a scalar potential chosen to mimic the equation of state of QCD, we observe a slight violation of the lower bound on the ratio of the bulk and shear viscosities conjectured in [1].

Original languageEnglish (US)
Article number085
JournalJournal of High Energy Physics
Issue number8
StatePublished - Aug 1 2008

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


  • Black holes in string theory
  • Gauge-gravity correspondence


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