NJL model of homogeneous neutral quark matter: Pseudoscalar diquark condensates revisited

Abstract

We use a Nambu-Jona Lasinio type model to investigate the phase diagram of dense quark matter under neutron star conditions in mean field approximation. The model contains selfconsistently determined quark masses and allows for diquark condensation in the scalar as well as in the pseudoscalar channel. The latter gives rise to the possibility of K^0 condensation in the CFL phase. In agreement with earlier studies we find that this CFLK^0 phase covers large regions of the phase diagram and that the predominant part of this phase is fully gapped. We show, however, that there exists a region at very low temperatures where the CFLK^0 solutions become gapless, possibly indicating an instability towards anisotropic or inhomogeneous phases. The physical significance of solutions with pseudoscalar diquark condensates in the 2SC phase is discussed as well.

16 pages, 12 figures; v2: minor modifications, version accepted for publication in PRD

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Cited by in corpus (6)

• The phase diagram of dense QCD
• Role of two-flavor color superconductor pairing in a three-flavor Nambu--Jona-Lasinio model with axial anomaly
• Ginzburg-Landau phase diagram for dense matter with axial anomaly, strange quark mass, and meson condensation
• Pseudo Nambu-Goldstone modes in neutron stars
• Color superconductivity in the Nambu Jona-Lasinio model complemented by a Polyakov loop
• Pseudoscalar mesons from a PNJL model at zero temperature