Cold Uniform Matter and Neutron Stars in the Quark-Meson-Coupling Model

Journal Article · Wed Aug 01 04:00:00 EDT 2007 · Nuclear Physics. A

DOI:https://doi.org/10.1016/j.nuclphysa.2007.05.011· OSTI ID:894187

Stone, J R; Guichon, P A.M.; Matevosyan, H H; Thomas, A W

A new density dependent effective baryon-baryon interaction has been recently derived from the quark-meson-coupling (QMC) model, offering impressive results in application to finite nuclei and dense baryon matter. This self-consistent, relativistic quark-level approach is used to construct the Equation of State (EoS) and to calculate key properties of high density matter and cold, slowly rotating neutron stars. The results include predictions for the maximum mass of neutron star models, together with the corresponding radius and central density, as well the properties of neutron stars with mass of order 1.4 M{sub {circle_dot}}. The cooling mechanism allowed by the QMC EoS is explored and the parameters relevant to slow rotation, namely the moment of inertia and the period of rotation investigated. The results of the calculation, which are found to be in good agreement with available observational data, are compared with the predictions of more traditional EoS, based on the A18+{delta}v+UIX* and modified Reid soft core potentials, the Skyrme SkM* interaction and two relativistic mean field (RMF) models for a hybrid stars including quark matter. The QMC EoS provides cold neutron star models with maximum mass 1.9-2.1 M{sub {circle_dot}}, with central density less than 6 times nuclear saturation density (n{sub 0} = 0.16 fm{sup -3}) and offers a consistent description of the stellar mass up to this density limit. In contrast with other models, QMC predicts no hyperon contribution at densities lower than 3n{sub 0}, for matter in {beta}-equilibrium. At higher densities, {Xi}{sup -,0} and {Lambda} hyperons are present. The absence of lighter {Sigma}{sup {+-},0} hyperons is understood as a consequence of antisymmetrization, together with the implementation of the color hyperfine interaction in the response of the quark bag to the nuclear scalar field.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA
• Sponsoring Organization: USDOE - Office of Energy Research (ER)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 894187
• Report Number(s): JLAB-THY-06-546; DOE/ER/40150-4083
• Journal Information: Nuclear Physics. A, Journal Name: Nuclear Physics. A Journal Issue: 3-4 Vol. 792; ISSN 0375-9474
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYON-BARYON INTERACTIONS
BARYONS
COLD NEUTRONS
COLOR
HYPERONS
IMPLEMENTATION
MOMENT OF INERTIA
NEUTRON STARS
NUCLEI
QUARK MATTER
QUARKS
ROTATION
SATURATION
SCALAR FIELDS
STAR MODELS
STARS