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 Nambu-Jona-Lasinio 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 quark-antiquark 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:
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Nuclear Physics A
- Pub Date:
- January 2001
- DOI:
- 10.1016/S0375-9474(00)00355-9
- arXiv:
- arXiv:hep-ph/0003019
- Bibcode:
- 2001NuPhA.679..597M
- Keywords:
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- High Energy Physics - Phenomenology;
- Nuclear Theory
- E-Print:
- 17 pages with 11 figures, a subsection added, more references added, Title modified, version to appear in Nuclear Physics A