Diquark and chiral condensate in a self-consistent NJL-type model

Abstract

In this work, a modified two-flavor NJL-type model is utilized, in which the contact current-current interaction is Fierz-transformed into quark-antiquark interactions and quark-quark interactions, which are directly related to the chiral condensate and diquark condensate, respectively. Under mean-field approximation, the chiral condensate and the diquark condensate are studied on the same footing. We discuss in detail the competition between the chiral condensate and the diquark condensate, which are exclusively paired with u and d quarks, while also investigating the order of the chiral phase transition through an analysis of the resulting chiral susceptibility.

arXiv comment9 pages,5 figures, Phys. Rev. D (2023) accepted

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• Hybrid stars with large quark cores within the parity doublet model and modified NJL model
• Two-flavor color superconducting quark stars may not exist
• Bayesian inference of strangeon matter using the measurements of PSR J0437-4715 and GW190814
• Speed of sound and polytropic index in QCD matter
• Constraining the competition between the deconfinement and chiral phase transitions in light of the multimessenger era