Journal of High Energy Physics

, 2011:95

Holographic bulk viscosity: GPR vs EO

Open Access

DOI: 10.1007/JHEP09(2011)095

Cite this article as:
Buchel, A., Gürsoy, U. & Kiritsis, E. J. High Energ. Phys. (2011) 2011: 95. doi:10.1007/JHEP09(2011)095


Recently Eling and Oz (EO) proposed a formula for the holographic bulk viscosity, in arXiv:1103.1657, derived from the null horizon focusing equation. This formula seems different from that obtained earlier by Gubser, Pufu and Rocha (GPR) in arXiv:0806.0407 calculated from the IR limit of the two-point function of the trace of the stress tensor. The two were shown to agree only for some simple scaling cases. We point out that the two formulae agree in two non-trivial holographic theories describing RG flows. The first is the strongly coupled \( \mathcal{N} = {2^*} \) gauge theory plasma. The second is the semi-phenomenological model of Improved Holographic QCD.


Gauge-gravity correspondence Duality in Gauge Field Theories AdS-CFT Correspondence 
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© The Author(s) 2011

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Authors and Affiliations

  1. 1.Department of Applied MathematicsUniversity of Western OntarioLondonCanada
  2. 2.Perimeter Institute for Theoretical PhysicsWaterlooCanada
  3. 3.Theory Group, Physics DepartmentCERNGeneva 23Switzerland
  4. 4.Crete Center for Theoretical Physics, Department of PhysicsUniversity of CreteHeraklionGreece
  5. 5.Laboratoire APCUniversité Paris-Diderot Paris 7, CNRS UMR 7164Paris Cedex 13France

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