Holographic bulk viscosity: GPR vs EO

Alex Buchel; Umut Gürsoy; Elias Kiritsis

doi:10.1007/JHEP09(2011)095

Holographic bulk viscosity: GPR vs EO

Alex Buchel^*, Umut Gürsoy, Elias Kiritsis

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

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 N = 2* gauge theory plasma. The second is the semi- phenomenological model of Improved Holographic QCD.

Original language	English
Article number	95
Journal	Journal of High Energy Physics
Volume	2011
Issue number	9
DOIs	https://doi.org/10.1007/JHEP09(2011)095
Publication status	Published - Sept 2011

Keywords

AdS-CFT Correspondence
Duality in Gauge Field Theories
Gauge-gravity correspondence

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abstract = "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 N = 2* gauge theory plasma. The second is the semi- phenomenological model of Improved Holographic QCD.",

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N2 - 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 N = 2* gauge theory plasma. The second is the semi- phenomenological model of Improved Holographic QCD.

AB - 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 N = 2* gauge theory plasma. The second is the semi- phenomenological model of Improved Holographic QCD.

KW - AdS-CFT Correspondence

KW - Duality in Gauge Field Theories

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JF - Journal of High Energy Physics

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ER -

Holographic bulk viscosity: GPR vs EO

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Keywords

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