Holographic Viscosity of Fundamental Matter

Abstract

A holographic dual of a finite-temperature SU(N_c) gauge theory with a small number of flavours N_f << N_c typically contains D-branes in a black hole background. By considering the backreaction of the branes, we demonstrate that, to leading order in N_f/N_c, the viscosity to entropy ratio in these theories saturates the conjectured universal bound eta/s >= 1/4π. The contribution of the fundamental matter eta_fund is therefore enhanced at strong 't Hooft coupling lambda; for example, eta_fund ~ lambda N_c N_f T^3 in four dimensions. Other transport coefficients are analogously enhanced. These results hold with or without a baryon number chemical potential.

arXiv comment6 pages

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Cited by in corpus (59)

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• Quantum critical transport, duality, and M-theory
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• Black Holes in Quasi-topological Gravity
• Thermodynamics of the brane
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• Holographic Hydrodynamics with a Chemical Potential
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• String Theory and Quantum Chromodynamics
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• D3-D7 Quark-Gluon Plasmas
• Probe Branes, Time-dependent Couplings and Thermalization in AdS/CFT
• Holographic phase transitions at finite chemical potential
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