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Speed of sound in QCD matter
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Speed of sound in QCD matter
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We systematically investigate the speed of sound in QCD matter under different conditions in the grand canonical ensemble within the Polyakov loop improved Nambu--Jona-Lasinio (PNJL) model. The numerical results indicate that the dependence of speed of sound on parameters like temperature and chemical potential can be indicative of QCD phase transition. Some new features of speed of sound are discovered, for instance, the hierarchy of sound velocity for $u(d)$ and $s$ quark at low temperature with the increasing chemical potential and the squared sound velocity approaching to almost zero in the critical region. We also formulate the relations between differently defined sound velocity using the fundamental thermodynamic relations. Some conclusions derived are useful for hydrodynamics simulation and calculation of transport coefficient of bulk viscosity.
Forward citations
Cited by 1 Pith paper
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Isentropic thermodynamics across the hadron-quark mixed phase in a two-phase model with a PNJL quark description
In a two-phase RMF+PNJL model, isentropic trajectories through the hadron-quark mixed phase heat at low entropy per baryon and cool near the critical end point, with entropy-dependent speed-of-sound structures.
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