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arXiv · hep-th/0610184

Holographic Viscosity of Fundamental Matter

David Mateos·Robert C. Myers·Rowan M. Thomson
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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.

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David Mateos, Robert C. Myers, Rowan M. Thomson. 2006-10-16. Holographic Viscosity of Fundamental Matter. https://doi.org/10.1103/physrevlett.98.101601

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