Color superconductivity and gapless modes in strange quark matter at finite temperatures

Journal Article · Fri Apr 01 04:00:00 EST 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.71.074023· OSTI ID:20708994

Mishra, Amruta; Mishra, Hiranmaya ^[1]

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1. Department of Physics, Indian Institute of Technology, New Delhi-110016 (India)

We investigate the phase diagram of strange quark matter in beta equilibrium where the lighter up and down quarks form the two flavor superconducting matter whereas the strange quark remains unpaired. This is studied 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 dependence of strange quark mass plays a sensitive role in maintaining charge neutrality conditions. At zero temperature the system goes from the gapless phase to the usual BCS phase through an intermediate normal phase as density is increased. However, at higher temperature the gapless to BCS transition becomes a smooth transition. The gapless modes show a smooth behavior with respect to temperature vanishing above a critical temperature which is larger than the BCS transition temperature.

• OSTI ID: 20708994
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 71; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BCS THEORY
COLOR MODEL
CRITICAL TEMPERATURE
D QUARKS
ELECTRIC CHARGES
FLAVOR MODEL
PHASE DIAGRAMS
POTENTIALS
QUANTUM FIELD THEORY
QUARK MATTER
REST MASS
S QUARKS
SUPERCONDUCTIVITY
VARIATIONAL METHODS