Quark matter in neutron stars within the Nambu-Jona-Lasinio model and confinement

Journal Article · Thu Mar 15 04:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.035804· OSTI ID:20995171

Baldo, M; Burgio, G F; Castorina, P; Plumari, S; Zappala, D ^[1]

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1. Dipartimento di Fisica, Universita di Catania and INFN, Sezione di Catania, Via S. Sofia 64, I-95123 Catania (Italy)

The quark matter equation of state (EoS) derived from the standard Nambu-Jona-Lasinio (NJL) model is soft enough to render neutron stars (NS) unstable at the onset of the deconfined phase, and no pure quark matter can be actually present in its interior. Since this is a peculiarity of the NJL model, we have studied a modified NJL model with a momentum cutoff which depends on the density. This procedure, which improves the agreement between QCD and NJL model at large density, modifies the standard NJL equation of state, and then it is potentially relevant for the stability analysis of neutron stars. We show that also within this approach, the NS instability still persists, and that the vacuum pressure, as a signal of quark confinement, has a fundamental role for the NS stability. In this respect, our conclusions point to a relationship between confinement and NS stability.

• OSTI ID: 20995171
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 75; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BAG MODEL
CONFINEMENT
DENSITY
EQUATIONS OF STATE
INSTABILITY
NEUTRON STARS
QUANTUM CHROMODYNAMICS
QUARK MATTER
STABILITY