https://doi.org/10.1140/epjp/s13360-023-04611-z
Regular Article
Thermal effects on the baryon–quark phase transition in hot hybrid neutron stars: a statistical mean-field baryonic model with the standard NJL model for deconfined quarks
Department of Physics, Faculty of Science, University of Kashan, P.O. Box 87317-53153, Kashan, Iran
Received:
10
July
2023
Accepted:
19
October
2023
Published online:
2
November
2023
We investigate the thermal effects on the baryon–quark phase transition (PT), utilizing the Maxwell construction (MC) in an isentropic analysis. In order to model the structure and composition of hot hybrid neutron stars (HHNSs) with 
-equilibrated dense matter in the presence (absence) of trapped neutrinos, we use a statistical model which agrees with the Thomas–Fermi (TF) approximation for the baryonic phase and the Nambu–Jona-Lasinio (NJL) model for the deconfined quark phase. Our results show that neutrino trapping can provide a considerable softening of the equation of state EOS in the baryon–quark coexistence phase, compared with the situation governed by untrapped (free-streaming) neutrinos. Having a weak dependence on the quark vector coupling constant in the pure quark phase, the temperature meets its maximum value at the threshold baryonic density for the occurrence of the baryon–quark PT. Based on the assumption of the conserved baryonic mass, all of our HHEOS lead to the stable mass structures for a HHNS.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
