2004/09/09 by D. Blaschke, H. Grigorian, A. Khalatyan +1
Physics and Astronomy · #hep-ph
paper · pdf · doi:10.1016/j.nuclphysbps.2004.12.021
published as Nucl. Phys. B (Proc. Suppl.) 141 (2005) 137 - 142 · 6 pages, 5 figures, to appear in the proceedings of the Workshop on QCD Down Under, Barossa Valley and Adelaide, Australia, 10-19 Mar 2004
arxiv created 2004/09/09 · arxiv updated 2009/12/01
We investigate a nonlocal chiral quark model with separable 4-fermion interaction for the case of U(3) flavor symmetry and show that strange quark matter is unlikely to occur in a large enough volume of a compact star to entail remarkable observational consequences. The phase diagram in the two-flavor sector of such model has a critical end point of the line of first order chiral/deconfinement phase transitions on which a triple point marks the junction with the critical line for second order phase transitions to two-flavor color superconductivity (2SC) below T~80 MeV. Stable hybrid star configurations with large quark matter core in a color superconducting phase can exist. A consistent cooling phenomenology requires that all quark species be gapped, the minimal pairing gap of the order of 10 - 100 keV.