skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

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.

Authors:
; ; ; ;  [1]
  1. Dipartimento di Fisica, Universita di Catania and INFN, Sezione di Catania, Via S. Sofia 64, I-95123 Catania (Italy)
Publication Date:
OSTI Identifier:
20995171
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 75; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.75.035804; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BAG MODEL; CONFINEMENT; DENSITY; EQUATIONS OF STATE; INSTABILITY; NEUTRON STARS; QUANTUM CHROMODYNAMICS; QUARK MATTER; STABILITY

Citation Formats

Baldo, M, Burgio, G F, Castorina, P, Plumari, S, and Zappala, D. Quark matter in neutron stars within the Nambu-Jona-Lasinio model and confinement. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.035804.
Baldo, M, Burgio, G F, Castorina, P, Plumari, S, & Zappala, D. Quark matter in neutron stars within the Nambu-Jona-Lasinio model and confinement. United States. https://doi.org/10.1103/PHYSREVC.75.035804
Baldo, M, Burgio, G F, Castorina, P, Plumari, S, and Zappala, D. 2007. "Quark matter in neutron stars within the Nambu-Jona-Lasinio model and confinement". United States. https://doi.org/10.1103/PHYSREVC.75.035804.
@article{osti_20995171,
title = {Quark matter in neutron stars within the Nambu-Jona-Lasinio model and confinement},
author = {Baldo, M and Burgio, G F and Castorina, P and Plumari, S and Zappala, D},
abstractNote = {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.},
doi = {10.1103/PHYSREVC.75.035804},
url = {https://www.osti.gov/biblio/20995171}, journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 3,
volume = 75,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}