Roles of axial anomaly on neutral quark matter with color superconducting phase

Journal Article · Wed Jun 01 00:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.114003· OSTI ID:21502680

Zhao, Zhang; Kunihiro, Teiji ^[1]

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1. School of Mathematics and Physics, North China Electric Power University, Beijing 102206 (China)

We investigate the effects of the axial-anomaly term with a chiral-diquark coupling on the phase diagram within a two-plus-one-flavor Nambu-Jona-Lasinio model under the charge-neutrality and {beta}-equilibrium constraints. We find that when such constraints are imposed, the new anomaly term plays a quite similar role as the vector interaction does on the phase diagram, which the present authors clarified in a previous work. Thus, there appear several types of phase structures with multiple critical points at low temperature T, although the phase diagrams with intermediate-T critical point(s) are never realized without these constraints even within the same model Lagrangian. This drastic change is attributed to an enhanced interplay between the chiral and diquark condensates due to the anomaly term at finite temperature; the u-d diquark coupling is strengthened by the relatively large chiral condensate of the strange quark through the anomaly term, which in turn definitely leads to the abnormal behavior of the diquark condensate at finite T, inherent to the asymmetric quark matter. We note that the critical point from which the crossover region extends to zero temperature appears only when the strength of the vector interaction is larger than a critical value. We also show that the chromomagnetic instability of the neutral asymmetric homogenous two-flavor color-superconducting phase is suppressed and can be even completely cured by the enhanced diquark coupling due to the anomaly term and/or by the vector interaction.

• OSTI ID: 21502680
• Journal Information: Physical Review. D, Particles Fields, Vol. 83, Issue 11; Other Information: DOI: 10.1103/PhysRevD.83.114003; (c) 2011 American Institute of Physics; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
CHIRALITY
CONDENSATES
COUPLING
EQUILIBRIUM
INSTABILITY
INTERACTIONS
LAGRANGIAN FUNCTION
PHASE DIAGRAMS
QUARK MATTER
S QUARKS
SIMULATION
DIAGRAMS
ELEMENTARY PARTICLES
FERMIONS
FUNCTIONS
INFORMATION
MATTER
PARTICLE PROPERTIES
QUARKS
STRANGE PARTICLES