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- W4320342357 abstract "We study the nuclear isentropic equation of state for a stellar matter composed of nucleons, hyperons, and $Delta$-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-$1/2$ baryonic octet and spin-$3/2$ decuplet determined in a unified manner relying on $text{SU}(6)$ and $text{SU}(3)$ symmetry arguments. We observe that $Lambda$ is the dominant exotic particle in the star at different entropies for both neutrino-free and neutrino-trapped stellar matter. For a fixed entropy, the inclusion of new particles (hyperons and/or delta resonances) in the stellar matter decreases the temperature. Also, an increase in entropy per baryon ($1;text{to}; 2$) with decreasing lepton number density ($0.4;text{to}; 0.2$) leads to an increase in stellar radii and a decrease in its mass due to neutrino diffusion. In the neutrino transparent matter, the radii decrease from entropy per baryon $2$ to $T,=,0$ without a significant change in stellar mass." @default.
- W4320342357 created "2023-02-13" @default.
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- W4320342357 date "2023-02-08" @default.
- W4320342357 modified "2023-09-26" @default.
- W4320342357 title "Exotic Baryons in Hot Neutron Stars" @default.
- W4320342357 doi "https://doi.org/10.48550/arxiv.2302.04364" @default.
- W4320342357 hasPublicationYear "2023" @default.
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