Compact stars with a quark core within the Nambu-Jona-Lasinio (NJL) model

Journal Article · Thu Jul 15 00:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.82.015809· OSTI ID:21389237

Lenzi, C H ^[1]; Schneider, A S ^[2]; Providencia, C ^[3]; Marinho, Jr, R M ^[1]

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1. Departamento de Fisica, Instituto Tecnologico de Aeronautica, Campo Montenegro, Sao Jose dos Campos, SP, 12228-900 (Brazil)
2. Department of Physics, Indiana University, Swain Hall West 117, 727 East Third Street Bloomington, Indiana 47405 (United States)
3. Centro de Fisica Computacional, Department of Physics, University of Coimbra, Rua Larga, Coimbra, P-3004-516 (Portugal)

An ultraviolet cutoff dependent on the chemical potential as proposed by Casalbuoni et al. is used in the SU(3) Nambu-Jona-Lasinio model. The model is applied to the description of stellar quark matter and compact stars. It is shown that with a new cutoff parametrization it is possible to obtain stable hybrid stars with a quark core. A larger cutoff at finite densities leads to a partial chiral symmetry restoration of quark s at lower densities. A direct consequence is the onset of the s quark in stellar matter at lower densities and a softening of the equation of state.

• OSTI ID: 21389237
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 82, Issue 1; Other Information: DOI: 10.1103/PhysRevC.82.015809; (c) 2010 The American Physical Society; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CHIRAL SYMMETRY
DENSITY
EQUATIONS OF STATE
QUARK MATTER
S QUARKS
SIMULATION
STARS
ULTRAVIOLET RADIATION
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
EQUATIONS
FERMIONS
MATTER
PHYSICAL PROPERTIES
QUARKS
RADIATIONS
STRANGE PARTICLES
SYMMETRY