Lepton effects on the protoneutron stars with the hadron-quark mixed phase in the Nambu-Jona-Lasinio model

Journal Article · Sun Feb 15 04:00:00 EST 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.79.043012· OSTI ID:21259978

Yasutake, Nobutoshi ^[1]; Kashiwa, Kouji ^[2]

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1. Division of Theoretical Astronomy, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan)
2. Department of Physics, Kyushu University, Fukuoka 810-8560 (Japan)

We study the structures of hybrid stars with leptons at finite temperature under beta equilibrium. For the quark phase, we use the three flavor Nambu-Jona-Lasinio (NJL) model. For the hadron phase, we adopt the nuclear equation of state (EOS) by Shen et al.. This EOS is in the framework of the relativistic mean field theory including the tree body effects. For the hadron-quark phase transition, we impose the bulk Gibbs construction or the Maxwell construction to take into account uncertainties by finite-size effects. We find that the pure quark phase does not appear in stable star cores in all cases. With the phase transition, the maximum masses increase {approx}10% for high lepton fraction. On the contrary, without the transition, they decrease {approx}10%. We also find that, in the NJL model, the lepton fraction is more important for structures of unstable stars than the temperature. This result is important for many astrophysical phenomena such as the core collapse of massive stars.

• OSTI ID: 21259978
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 4 Vol. 79; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASTROPHYSICS
CONSTRUCTION
EQUATIONS OF STATE
EQUILIBRIUM
FLAVOR MODEL
HADRONS
LEPTONS
MASS
MAXWELL EQUATIONS
MEAN-FIELD THEORY
NEUTRON STARS
PHASE TRANSFORMATIONS
QUARKS
RELATIVISTIC RANGE
SIMULATION