Two flavor color superconductivity in nonlocal chiral quark models

Abstract

We study the competence between chiral symmetry restoration and two flavor color superconductivity (2SC) using a relativistic quark model with covariant nonlocal interactions. We consider two different nonlocal regulators: a Gaussian regulator and a Lorentzian regulator. We find that although the phase diagrams are qualitative similar to those obtained using models with local interactions, in our case the superconducting gaps at medium values of the chemical potential are larger. Consequently, we obtain that in that region the critical temperatures for the disappearance of the 2SC phase might be of the order of 100-120 MeV. We also find that for ratios of the quark-quark and quark-antiquark couplings somewhat above the standard value 3/4, the end point and triple point in the $T-\mu$ phase diagram meet and a phase where both the chiral and diquark condensates are non-negligible appears.

15 pages incl. 5 Postscript figures

References in corpus (8)

• NJL-model analysis of dense quark matter
• Critical point of QCD at finite T and μ, lattice results for physical quark masses
• The Quark-Gluon Plasma in Equilibrium
• The Equation of State for Two Flavor QCD at Non-zero Chemical Potential
• Light pseudoscalar mesons in a nonlocal SU(3) chiral quark model
• Baryon structure in a quark-confining non-local NJL model
• Coexistence of color superconductivity and chiral symmetry breaking within the NJL model
• Numerical Portrait of a Relativistic BCS Gapped Superfluid

Cited by in corpus (14)

• The phase diagram of three-flavor quark matter under compact star constraints
• Nonlocal SU(3) chiral quark models at finite temperature: the role of the Polyakov loop
• On covariant nonlocal chiral quark models with separable interactions
• Nonlocal Polyakov-Nambu-Jona-Lasinio model with wavefunction renormalization at finite temperature and chemical potential
• Hybrid stars within a covariant, nonlocal chiral quark model
• Meson properties at finite temperature in a three flavor nonlocal chiral quark model with Polyakov loop
• Phase diagram of neutral quark matter in nonlocal chiral quark models
• Characteristics of the chiral phase transition in nonlocal quark models
• Nonlocality effects on Color Spin Locking condensates
• Strong-interaction matter under extreme conditions from chiral quark models with nonlocal separable interactions
• The Nuclear matter stability in a non-local chiral quark model
• Asymptotically conformal CFL quark matter within a nonlocal chiral quark model
• Nonlocality effects on spin-one pairing patterns in two-flavor color superconducting quark matter and compact stars applications
• Phase diagram of neutron star quark matter in nonlocal chiral models