Exploring the QCD phase diagram with compact stars
Abstract
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.
Cite
@article{arxiv.hep-ph/0409116,
title = {Exploring the QCD phase diagram with compact stars},
author = {D. Blaschke and H. Grigorian and A. Khalatyan and D. N. Voskresensky},
journal= {arXiv preprint arXiv:hep-ph/0409116},
year = {2007}
}
Comments
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