Bulk viscosity of the gluon plasma in a holographic approach
Abstract
A gravity-scalar model in 5-dim. Riemann space is adjusted to the thermodynamics of SU(3) gauge field theory in the temperature range 1 - 10 T/Tc to calculate holographically the bulk viscosity in 4-dim. Minkowski space. Various settings are compared, and it is argued that, upon an adjustment of the scalar potential to reproduce exactly the lattice data within a restricted temperature interval above Tc, rather robust values of the bulk viscosity to entropy density ratio are obtained.
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