Quark core of protoneutron stars in the phase diagram of quark matter
2007 (English)In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 75, no 12Article in journal (Refereed) Published
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 1053 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.
Place, publisher, year, edition, pages
2007. Vol. 75, no 12
Research subject Fysik
IdentifiersURN: urn:nbn:se:ltu:diva-6367DOI: 10.1103/PhysRevD.75.125013Local ID: 49975e90-cb0a-11db-b3ed-000ea68e967bOAI: oai:DiVA.org:ltu-6367DiVA: diva2:979244
Validerad; 2007; Bibliografisk uppgift: Paper id:: 125013; 20070305 (ysko)2016-09-292016-09-29Bibliographically approved