Color superconducting 2SC+s quark matter and gapless modes at finite temperatures

Abstract

We investigate the phase diagram of color superconducting quark matter with strange quarks (2SC+s quark matter) in beta equliibrium at zero as well as finite temperatures within a Nambu-Jona-Lasinio model. The variational method as used here allows us to investigate simultaneous formation of condensates in quark--antiquark as well as in diquark channels. Color and electric charge neutrality conditions are imposed in the calculation of the thermodynamic potential. Medium dependance of strange quark mass plays a sensitve role in maintaining charge neutrality conditions. At zero temperature the system goes from gapless phase to usual BCS phase through an intermediate normal phase as density is increased. The gapless modes show a smooth behaviour with respect to temperature vanishing above a critical temperature which is larger than the BCS transition temperature. We observe a sharp transition from gapless superconducting phase to the BCS phase as density is increased for the color neutral matter at zero temperature. As temperature is increased this however becomes a smooth transition.

18 pages, 14 figures

References in corpus (8)

• Chromomagnetic instability in dense quark matter
• Screening masses in neutral two-flavor color superconductor
• Evaluating the Gapless Color-Flavor Locked Phase
• Phase diagram of dense neutral three-flavor quark matter
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• Effect of strong magnetic field on competing order parameters in two-flavor dense quark matter
• Chiral symmetry breaking, color superconductivity, and the equation of state for magnetized strange quark matter
• Effect of temperature and magnetic field on two-flavor superconducting quark matter
• Light vector mesons ($\omega$, $\rho$ and $\varphi$) in strong magnetic fields: A QCD sum rule approach
• Color-flavor locked strangelets in a quark mass density-dependent model
• Color superconductivity with determinant interaction in strange quark matter
• LOFF and breached pairing with cold atoms