The Double Life of Thermal QCD

6th International Symposium on Quantum Theory and Symmetries

Mia, Mohammed^1 ; Dasgupta, Keshav^1 ; Gale, Charles^1 ; Jeon, Sangyong^1

Department of Physics, McGill University, 3600 rue University, Montréal, QC H3A 2T8, Canada^1

关键词: AdS/CFT;    Condensed matter;    Entropy ratio;    Gauge couplings;    Gauge theory;    Stress tensors;    Supergravity;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/462/1/012009/pdf
DOI  :  10.1088/1742-6596/462/1/012009

来源: IOP

【 摘 要 】

We study the gravity dual of a thermal gauge theory whose behavior parallels that of thermal QCD in the far IR. The UV of our theory has infinite degrees of freedom. We holographically renormalize the supergravity action to compute the stress tensor of the dual gauge theory with fundamental flavors incorporating the logarithmic running of the gauge coupling. From the stress tensor we obtain the shear viscosity and the entropy of the medium at a temperature T, and investigate the violation of the bound for the viscosity to the entropy ratio. This is a shortened and simplified companion paper to hep-th/0902.1540, and is based on the talks given by M. Mia at the "Strong and Electroweak Matter 2008" workshop and the McGill workshop on "AdS/CFT, Condensed Matter and QCD" in the fall of 2008; and K. Dasgupta at the "Sixth International Symposium on Quantum Theory and Symmetries (QTS6)", July 2009.