Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-12-17
Phys.Rev.D81:054033,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 12 figures; v2: minor modifications, version accepted for publication in PRD
Scientific paper
10.1103/PhysRevD.81.054033
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.
Basler Hannes
Buballa Michael
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