2003/12/15 by Débora P. Menezes, D. P. Menezes, Constança Providência +1 · 1 citation
Physics and Astronomy · #Astrophysics #Baryon #Equation of state #Hadron #Hyperon #Neutrino #Nuclear physics research studies #Particle physics #Phase transition #Physics #Pulsars and Gravitational Waves Research #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #Quark star #Star (game theory) #Stars #Strange matter #nucl-th
paper · pdf · doi:10.1103/physrevc.69.045801
published as Phys.Rev. C69 (2004) 045801 · 8 pages, 8 figures, 1 table
arxiv created 2003/12/15 · openalex publication_date 2004/04/02 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The properties of hybrid stars formed by hadronic and quark matter in \ensuremathβ equilibrium at fixed entropies are described by appropriate equations of state (EOSs) in the framework of relativistic mean-field theory. In this work we include the possibility of neutrino trapped EOS and compare the star properties with the ones obtained after deleptonization, when neutrinos have already diffused out. We use the nonlinear Walecka model for the hadron matter with two different sets for the hyperon couplings and the MIT Bag and the Nambu-Jona-Lasinio (NJL) models for the quark matter. The phase transition to a deconfined quark phase is investigated. Depending on the model and the parameter set used, the mixed phase may or may not exist in the EOSs at high densities. The star properties are calculated for each equation of state. The maximum mass stellar configurations obtained within the NJL have larger masses than the ones obtained within the Bag model. The Bag model predicts a mixed phase in the interior of the most massive stable stars while, depending on the hyperon couplings, the NJL model predicts a mixed phase or pure quark matter. Comparing with neutrino free stars, the maximum allowed baryonic masses for protoneutron stars are \ensuremath∼0.4M_\astrosun larger for the Bag model and \ensuremath∼0.1M_\astrosun larger for the NJL model when neutrino trapping is imposed.