Employing 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.Comment: 19 pages, 13 figures. Version published in PL