For the quadratic-dilaton Einstein-dilaton holographic model, the vector-sector dispersion relation gives η/s = 1/(4π), and the Kubo-formula bulk viscosity matches JETSCAPE data within a fitted range of the dilaton parameter c.
In this sector, we find just one independent equation that may be written as ∂2 z H12 − ∂z ln ζ 4 1 f ζ2 ∂zH12 + ζ 2 1 ω2 − q2f ζ 2 2 f 2 H12 = 0
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Transport coefficients and quasinormal modes in Einstein-dilaton holographic QCD
For the quadratic-dilaton Einstein-dilaton holographic model, the vector-sector dispersion relation gives η/s = 1/(4π), and the Kubo-formula bulk viscosity matches JETSCAPE data within a fitted range of the dilaton parameter c.