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

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dc.creatorBaldo, M.
dc.creatorBurgio, G. F.
dc.creatorCastorina, P.
dc.creatorPlumari, S.
dc.creatorZappala', D.
dc.date2006-07-31
dc.date2007-02-01
dc.date.accessioned2026-07-07T10:25:13Z
dc.date.available2026-07-07T10:25:13Z
dc.descriptionThe 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 cut-off 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.
dc.description5 pages,5 eps figures, title changed, references added, accepted by Phys. Rev. C (Brief Report)
dc.identifierhttps://arxiv.org/abs/hep-ph/0607343
dc.identifierhttp://arxiv.org/abs/hep-ph/0607343
dc.identifierPhys.Rev.C75:035804,2007
dc.identifierdoi:10.1103/PhysRevC.75.035804
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/176467
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.subjectNuclear Theory
dc.titleQuark matter in neutron stars within the Nambu - Jona-Lasinio model and confinement
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