Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-26
Phys.Rev.D75:125013,2007
Astronomy and Astrophysics
Astrophysics
18 pages, 25 figures, accepted for publication in Phys. Rev. D. Updated references and acknowledgements
Scientific paper
10.1103/PhysRevD.75.125013
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.
Blaschke David
Sandin Fredrik
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