Deconfinement of neutron star matter within the Nambu-Jona-Lasinio model

Journal Article · Sat Aug 15 04:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.80.045017· OSTI ID:21322513

Lugones, G ^[1]; Grunfeld, A G ^[2]; Scoccola, N N ^[2]; Villavicencio, C ^[3]

---

1. Universidade Federal do ABC, Centro de Ciencias Naturais e Humanas, Rua Santa Adelia, 166, 09210-170, Santo Andre (Brazil)
2. CONICET, Rivadavia 1917, (1033) Buenos Aires (Argentina)
3. Departmento de Fisica, Comision Nacional de Energia Atomica, (1429) Buenos Aires (Argentina)

We study the deconfinement transition of hadronic matter into quark matter under neutron star conditions assuming color and flavor conservation during the transition. We use a two-phase description. For the hadronic phase we use different parametrizations of a nonlinear Walecka model which includes the whole baryon octet. For the quark-matter phase we use an SU(3){sub f} Nambu-Jona-Lasinio effective model including color superconductivity. Deconfinement is considered to be a first order phase transition that conserves color and flavor. It gives a short-lived transitory colorless-quark phase that is not in {beta} equilibrium, and decays to a stable configuration in {tau}{approx}{tau}{sub weak}{approx}10{sup -8} s. However, in spite of being very short lived, the transition to this intermediate phase determines the onset of the transition inside neutron stars. We find the transition free-energy density for temperatures typical of neutron star interiors. We also find the critical mass above which compact stars should contain a quark core and below which they are safe with respect to a sudden transition to quark matter. Rather independently on the stiffness of the hadronic equation of state (EOS) we find that the critical mass of hadronic stars (without trapped neutrinos) is in the range of {approx}1.5-1.8 solar masses. This is in coincidence with previous results obtained within the MIT bag model.

• OSTI ID: 21322513
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 4 Vol. 80; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BAG MODEL
BARYON OCTETS
CONFIGURATION
CRITICAL MASS
EQUATIONS OF STATE
EQUILIBRIUM
FREE ENERGY
HADRONS
NEUTRINOS
NEUTRON STARS
NONLINEAR PROBLEMS
PHASE TRANSFORMATIONS
QUARK MATTER
QUARKS
SIMULATION
SU-3 GROUPS
SUPERCONDUCTIVITY
WALECKA MODEL