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

Understand

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.