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.
Gluon Condensate, Wilson Loops and Gauge/String Duality
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We test gauge/string duality by evaluating expectation values of small Wilson loops in pure Yang-Mills theories. On the gauge-theory side, there exists rich phenomenology. The dual formulation provides with a universal language to evaluate the gluon condensate and quadratic correction in terms of the metric in the fifth coordinate. Quantitatively, the estimated value of the gluon condensate is approximately 0.010 GeV^4.
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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.