Thermal Transport and Drag Force in Improved Holographic QCD
Umut G\"ursoy, Elias Kiritsis, Georgios Michalogiorgakis, Francesco, Nitti
TL;DR
This paper uses Improved Holographic QCD to compute transport coefficients like bulk viscosity, drag force, and jet quenching, revealing their behavior near phase transitions and consistency with experimental data.
Contribution
It provides new holographic calculations of QCD transport properties incorporating improved models that account for asymptotic freedom effects.
Findings
Bulk viscosity rises near phase transition but stays below shear viscosity.
Drag force reflects asymptotic freedom effects with velocity and temperature.
Jet quenching parameter aligns with experimental lower bounds.
Abstract
We calculate the bulk viscosity, drag force and jet quenching parameter in Improved Holographic QCD. We find that the bulk viscosity rises near the phase transition but does not exceed the shear viscosity. The drag force shows the effects of asymptotic freedom both as a function of velocity and temperature. It indicates diffusion times of heavy quarks in rough agreement with data. The jet quenching parameter values computed via the light-like Wilson loop are in the lower range suggested by data.
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