Shear viscosity and phase diagram from Polyakov–Nambu–Jona-Lasinio model

2014/11/12 by Sanjay K. Ghosh, Sibaji Raha, Rajarshi Ray +2 · 31 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #High-Energy Particle Collisions Research #Materials science #Phase (matter) #Phase diagram #Phase transition #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Shear (geology) #Shear viscosity #Thermodynamics #Viscosity #hep-ph #nucl-th

paper · pdf · doi:10.1103/physrevd.91.054005

published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 91(5) (American Physical Society) · 13 pages, 8 figures

arxiv created 2014/11/12 · openalex publication_date 2015/03/03 · arxiv updated 2015/03/11 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We present a detailed study of the variation of shear viscosity \ensuremathη, with temperature and baryon chemical potential within the framework of the Polyakov--Nambu--Jona-Lasinio model. \ensuremathη is found to depend strongly on the spectral width of the quasiparticles present in the model. The variation of \ensuremathη across the phase diagram has distinctive features for different kinds of transitions. These variations have been used to study the possible location of the critical end point and are cross-checked with similar studies of variations of specific heat. Finally, using a parametrization of the freeze-out surface in heavy-ion collision experiments, the variation of the shear viscosity to entropy density ratio has also been discussed as a function of the center-of-mass energy of collisions.

Citations

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Cited by

• Collision energy dependence of elliptic flow splitting between particles and their antiparticles from an extended multiphase transport model
• Thermodynamic properties and transport coefficients of QCD matter within the nonextensive Polyakov–Nambu–Jona-Lasinio model