Thermal transport and drag force in improved holographic QCD

By U. Gursoy, E. Kiritsis, Georgios Michalogiorgakis, Francesco Nitti. 2009

363 citations recorded by the source corpus.

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.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/8ef62f69615591e2fa8e221ccb92e81b6a6ea5dc

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In Nuclear and High Energy Physics

1. V. Hubeny
2. M. Rangamani
3. E. Kiritsis
4. S. Gubser
5. D. Mateos
6. R. Myers
7. Hong Liu
8. Francesco Nitti

Citations in the corpus

• Gauge/String Duality, Hot QCD and Heavy Ion Collisions (2011, background): “q̂ also increases with increasing nonconformality in strongly coupled N = 2∗ gauge theory [461,462].”
• A Holographic View on Physics out of Equilibrium (2010, methodology): “Futhermore, in the authors of [133, 134] have examined the details of Langevin dynamics under the improved holographic QCD framework; in particular, these works compute the full Langevin correlator in non-conformal models, with the aim of using these results for studies of QGP.”
• Improved Holographic QCD (2010, methodology): “In [76] we obtain the small ǫ estimate of I(ǫ) that vanishes as ∼ ǫ(log ǫ) 4 3 .”
• Heavy ions and string theory (2013, background): “k viscosity divided by entropy density of IHQCD (solid curve) compared to the universal value of shear viscosity per entropy density (dashed line) and lattice data for SU(3) gluodynamics. Figure from [169]. 54 where r! is the point where the zero-temperature string scale factor A s,o (r)hasa minimum”