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.

6 pages

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Cited by in corpus (29)

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• The ratio of shear viscosity to entropy density in generalized theories of gravity
• Holography and Unquenched Quark-Gluon Plasmas
• Relaxation time of a CFT plasma at finite coupling
• Comments on Fermi Liquid from Holography
• Bright branes for strongly coupled plasmas
• Shear viscosity of CFT plasma at finite coupling
• Screening effects on meson masses from holography
• On the energy deposited by a quark moving in an N=4 SYM plasma
• Adding flavour to the Polchinski-Strassler background
• On holographic phase transitions at finite chemical potential
• A note on conductivity and charge diffusion in holographic flavour systems
• Isospin diffusion in thermal AdS/CFT with flavor
• The high momentum behavior of a quark wake
• Non-relativistic D3-brane in the presence of higher derivative corrections
• Unquenched flavor in the gauge/gravity correspondence
• Viscosity bound for anisotropic superfluids in higher derivative gravity
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• A modulated shear to entropy ratio
• D7-brane dynamics and thermalization in the Kuperstein-Sonnenschein model
• From Thermodynamics to the Bound on Viscosity
• Non-equilibrium dynamics of Goldstone excitation from holography
• In-medium effects in the holographic quark-gluon plasma
• Spacetime singularity resolution by M-theory fivebranes: calibrated geometry, Anti-de Sitter solutions and special holonomy metrics