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Abstract

The effects of temperature and baryon chemical potential on equation of state and thermodynamics of isospin imbalanced QCD matter are investigated in the framework of two-flavor Nambu−Jona-Lasinio model. The equation of state at zero temperature and baryon chemical potential as well as the isospin density and normalized pressure at finite temperature are shown to be consistent with the lattice data. We also find that the energy per isospin increases monotonically with the increase of isospin density at vanishing temperature and baryon chemical potential, while it first decreases and then increases with the augment of isospin density, behaving as a non-symmetric parabolic curve. Finally, we compute the sound velocity and find that it is discontinuous at the phase transition point for finite temperature and/or baryon chemical potential. In particular, the sound velocity in the superfluid phase is distinctly larger than that in the ordinary nuclear matter and quark matter, while the temperature and baryon chemical potential included in the superfluid phase makes the equation of state softer and the sound velocity slower.

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Authors and contacts

Corresponding author:Lu Zhen-Yan,luzhenyan@hnust.edu.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant No. 11947135), the Natural Science Foundation of Hunan Province, China (Grant Nos. 2018JJ2111, 2020JJ4284), the Scientific Research Project of Hunan University of Science and Technology, China (Grant No. E52059), and the Natural Science Foundation for Young Scientists of Shanxi Province, China (Grant No. 201901D211110)

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Vol. 70, Issue 14 - 2021-07-20

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