Quark matter in neutron stars within the Nambu - Jona-Lasinio model and confinement
arXiv:hep-ph/0607343 · doi:10.1103/PhysRevC.75.035804
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 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.
5 pages,5 eps figures, title changed, references added, accepted by Phys. Rev. C (Brief Report)
Cited by in corpus (17)
- Modern compact star observations and the quark matter equation of state
- Hadron-quark mixed phase in hyperon stars
- Astrophysical Implications of Equation of State for Hadron-Quark Mixed Phase: Compact Stars and Stellar Collapses
- Deconfinement phase transition in hybrid neutron stars from the Brueckner theory with three-body forces and a quark model with chiral mass scaling
- Stability of CFL cores in Hybrid Stars
- Quark deconfinement transition in hyperonic matter
- Magnetized strange quark matter in a quasiparticle description
- Hybrid neutron stars with the Dyson-Schwinger quark model and various quark-gluon vertices
- Chiral model approach to quark matter nucleation in neutron stars
- Astrophysical constraints on the confining models : the Field Correlator Method
- Structure of hybrid protoneutron stars within the Nambu--Jona-Lasinio model
- Higher mass limits of neutron stars from the equation of states in curved spacetime
- Nonet meson properties in Nambu--Jona-Lasinio model with dimensional versus cutoff regularization
- Hyperons, deconfinement and the speed of sound in neutron stars
- Structure and tidal deformability of a hybrid star within the framework of the field correlator method
- Quark deconfinement in neutron star cores and the ground state of neutral matter
- Influence of hyperon-hyperon interaction on the properties of neutron stars