$Δ$-admixed neutron stars: spinodal instabilities and dUrca processes

Adriana R. Raduta

doi:10.1016/j.physletb.2021.136070

paper

$Δ$ -admixed neutron stars: spinodal instabilities and dUrca processes

arXiv:2101.03718 · doi:10.1016/j.physletb.2021.136070

Abstract

Within the covariant density functional theory of nuclear matter we build equations of state of $Δ$ -admixed compact stars. Uncertainties in the interaction of $Δ (1232)$ resonance states with nuclear matter, due to lack of experimental data, are accounted for by varying the coupling constants to scalar and vector mesonic fields. We find that, over a wide range of the parameter space allowed by nuclear physics experiments and astrophysical observations, cold catalyzed star matter exhibits a first order phase transition which persists also at finite temperature and out of $β$ -equilibrium in the neutrino-transparent matter. Compact stars featuring such a phase transition in the outer core have small radii and, implicitly, tidal deformabilities. The parameter space is identified where simultaneously $Δ$ -admixed compact stars obey the astrophysical constraint on maximum mass and allow for dUrca processes, which is otherwise forbidden.

arXiv comment9 pages, 7 figures

$Δ$ -admixed neutron stars: spinodal instabilities and dUrca processes

Abstract

References in corpus (46)

Cited by in corpus (32)

Δ-admixed neutron stars: spinodal instabilities and dUrca processes

Abstract

References in corpus (46)

Cited by in corpus (32)

$Δ$ -admixed neutron stars: spinodal instabilities and dUrca processes