The quark core of protoneutron stars in the phase diagram of quark matter

Abstract

We study the effect of neutrino trapping in new-born quark stars within a three-flavor Nambu - Jona-Lasinio (NJL) model with self-consistently calculated quark masses. The phase diagrams and equations of state for charge neutral quark matter in beta-equilibrium are presented, with and without trapped neutrinos. The compact star sequences for different neutrino untrapping scenarios are investigated and the energy release due to neutrino untrapping is found to be of the order of 10^53 erg. We find that hot quark stars characterized, e.g., by an entropy per baryon of 1-2 and a lepton fraction of 0.4, as models for the cores of newborn protoneutron stars, are in the two-flavor color superconducting (2SC) state. High temperatures and/or neutrino chemical potentials disfavor configurations with a color-flavor-locked (CFL) phase. Stable quark star solutions with CFL cores exist only at low temperatures and neutrino chemical potentials.

18 pages, 25 figures, accepted for publication in Phys. Rev. D. Updated references and acknowledgements

References in corpus (2)

• Neutron Star Observations: Prognosis for Equation of State Constraints
• Two lectures on color superconductivity

Cited by in corpus (9)

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• Equilibrium sequences of non rotating and rapidly rotating crystalline color superconducting hybrid stars
• A new possible quark-hadron mixed phase in protoneutron stars
• Formation of Quark Phases in compact stars and their connection to Gamma-Ray-Bursts
• Neutral quark matter in a Nambu-Jona Lasinio model with vector interaction
• Is there Quark Matter in (Low-Mass) Pulsars?