Equation of state and viscosities from a gravity dual of the gluon plasma
- Yaresko, R.
- Kämpfer, B.
Publication date
July 2015
DOI Publisher
The Authors. Published by Elsevier B.V.Abstract
AbstractEmploying new precision data of the equation of state of the SU(3) Yang–Mills theory (gluon plasma) the dilaton potential of a gravity-dual model is adjusted in the temperature range (1–10)Tc within a bottom-up approach. The ratio of bulk viscosity to shear viscosity follows then as ζ/η≈πΔvs2 for Δvs2<0.2 and achieves a maximum value of 0.94 at Δvs2≈0.3, where Δvs2≡1/3−vs2 is the non-conformality measure and vs2 is the velocity of sound squared, while the ratio of shear viscosity to entropy density is known as (4π)−1 for the considered set-up with Hilbert action on the gravity side
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