Exotic Baryons in Hot Neutron Stars
Adamu Issifu, Kauan D. Marquez, Mateus R. Pelicer, and D\'ebora P., Menezes

TL;DR
This paper models the hot, dense matter inside neutron stars including exotic particles like hyperons and delta resonances, analyzing how their presence affects star evolution, structure, and temperature during cooling and neutrino diffusion.
Contribution
It introduces a relativistic mean-field model with density-dependent couplings to study the composition and thermal evolution of neutron stars with exotic baryons.
Findings
Lambda is the dominant exotic particle in the star.
Including hyperons and delta resonances lowers the stellar temperature.
Higher entropy increases stellar radius and decreases mass during neutrino diffusion.
Abstract
We study the nuclear isentropic equation of state for a stellar matter composed of nucleons, hyperons, and -resonances. We investigate different snapshots of the evolution of a neutron star, from its birth as a lepton-rich protoneutron star in the aftermath of a supernova explosion to a lepton-poor regime when the star starts cooling to a catalyzed configuration. We use a relativistic model within the mean-field approximation to describe the hot stellar matter and adopt density-dependent couplings adjusted by the DDME2 parameterization. We use baryon-meson couplings for the spin- baryonic octet and spin- decuplet determined in a unified manner relying on and symmetry arguments. We observe that is the dominant exotic particle in the star at different entropies for both neutrino-free and neutrino-trapped stellar matter. For a fixed…
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Taxonomy
TopicsPulsars and Gravitational Waves Research · Gamma-ray bursts and supernovae · Cosmology and Gravitation Theories
