$\Delta$-admixed neutron stars: spinodal instabilities and dUrca processes

Abstract

Within the covariant density functional theory of nuclear matter we build equations of state of $\Delta$-admixed compact stars. Uncertainties in the interaction of $\Delta (1232)$ 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 $\beta$-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 $\Delta$-admixed compact stars obey the astrophysical constraint on maximum mass and allow for dUrca processes, which is otherwise forbidden.

9 pages, 7 figures

References in corpus (19)

• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• PSR J0030+0451 Mass and Radius from NICER Data and Implications for the Properties of Neutron Star Matter
• A NICER View of PSR J0030+0451: Millisecond Pulsar Parameter Estimation
• Tidal Love numbers of neutron stars
• Constraints on the Symmetry Energy Using the Mass-Radius Relation of Neutron Stars
• Constraining hypernuclear density functional with $\Lambda$-hypernuclei and compact stars
• Critical Density and Impact of $\Delta (1232)$ Resonance Formation in Neutron Stars
• Implications from GW170817 for $\Delta$-isobar admixed hypernuclear compact stars
• Interdependence of different symmetry energy elements
• Statistical theory of thermal evolution of neutron stars
• Relativistic hypernuclear compact stars with calibrated equations of state
• Hot and dense hadronic matter in an effective mean field approach
• $\Delta$ (1232) effects in density-dependent relativistic Hartree-Fock theory and neutron stars
• Cluster formation in compact stars: relativistic versus Skyrme models
• Thermal evolution of relativistic hyperonic compact stars with calibrated equations of state
• Isospin fractionation : equilibrium versus spinodal decomposition
• Measuring Nuclear Matter Parameters with NICER and LIGO/Virgo
• Examination of strangeness instabilities and effects of strange meson couplings in dense strange hadronic matter and compact stars

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• Translating neutron star observations to nuclear symmetry energy via artificial neural networks
• Extracting nuclear matter properties from the neutron star matter equation of state using deep neural networks
• Baryonic models of ultra-low-mass compact stars for the central compact object in HESS J1731-347
• Oscillating magnetised hybrid stars under the magnifying glass of multi-messenger observations
• Influence of the nuclear symmetry energy slope on observables of compact stars with $\Delta$-admixed hypernuclear matter
• Strangeness thermodynamic instabilities in hot and dense nuclear matter
• Light hyperclusters and hyperons in low-density hot stellar matter