Chiral symmetry breaking, color superconductivity and quark matter phase diagram: a variational approach
Abstract
We discuss in this note simultaneous existence of chiral symmetry breaking and color superconductivity at finite temperature and density in a NambuJonaLasinio type model. The methodology involves an explicit construction of a variational ground state and minimisation of the thermodynamic potential. There exist nontrivial solutions to the gap equations at finite densities with both quarkantiquark as well as diquark condensates for the "ground" state. However, such a phase is thermodynamically unstable with the pressure being negative in this region. We also compute the equation of state, and obtain the structure of the phase diagram in the model.
 Publication:

Nuclear Physics A
 Pub Date:
 January 2001
 DOI:
 10.1016/S03759474(00)003559
 arXiv:
 arXiv:hepph/0003019
 Bibcode:
 2001NuPhA.679..597M
 Keywords:

 High Energy Physics  Phenomenology;
 Nuclear Theory
 EPrint:
 17 pages with 11 figures, a subsection added, more references added, Title modified, version to appear in Nuclear Physics A