A thermodynamically consistent quasi-particle model without density-dependent infinity of the vacuum zero point energy

Abstract

In this paper, we generalize the improved quasi-particle model proposed in J. Cao et al., [ Phys. Lett. B {\bf711}, 65 (2012)] from finite temperature and zero chemical potential to the case of finite chemical potential and zero temperature, and calculate the equation of state (EOS) for (2+1) flavor Quantum Chromodynamics (QCD) at zero temperature and high density. We first calculate the partition function at finite temperature and chemical potential, then go to the limit $T=0$ and obtain the equation of state (EOS) for cold and dense QCD, which is important for the study of neutron stars. Furthermore, we use this EOS to calculate the quark-number density, the energy density, the quark-number susceptibility and the speed of sound at zero temperature and finite chemical potential and compare our results with the corresponding ones in the existing literature.

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Cited by in corpus (6)

• Thermodynamic consistency, quark mass scaling, and properties of strange matter
• The chiral phase transition with a chiral chemical potential in the framework of Dyson-Schwinger equations
• Strange matter and strange stars in a thermodynamically self-consistent perturbation model with running coupling and running strange quark mass
• Strange quark matter and proto-strange stars in an equivaparticle model
• Baryon Number Fluctuations in Quasi-particle Model
• Nonextensive quasiparticle description of QCD matter