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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Stellar properties and nuclear matter constraints

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Author(s):
Dutra, Mariana [1] ; Lourenco, Odilon [2] ; Menezes, Debora P. [3]
Total Authors: 3
Affiliation:
[1] Univ Fed Fluminense, Dept Ciencias Nat IHS, BR-28895532 Rio Das Ostras, RJ - Brazil
[2] Univ Fed Sao Carlos, CCA, Dept Ciencias Nat Matemat & Educ, BR-13600970 Araras, SP - Brazil
[3] Univ Fed Santa Catarina, CFM, Dept Fis, CP 476, BR-88040900 Florianopolis, SC - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Physical Review C; v. 93, n. 2 FEB 16 2016.
Web of Science Citations: 23
Abstract

We analyze the stellar properties of the relativistic mean-field (RMF) parametrizations shown to be consistent with the recently studied constraints related to nuclear matter, pure neutron matter, symmetry energy, and its derivatives {[}Phys. Rev. C 90, 055203 (2014)]. Our results show that only two RMF parametrizations do not allow the emergence of the direct Urca process, important aspect regarding the evolution of a neutron star. Moreover, among all approved RMF models, fourteen of them produce neutron stars with maximum masses inside the range 1.93 <= M/M-circle dot <= 2.05, with M-circle dot being the solar mass. Only three models yield maximum masses above this range and a discussion on the inclusion of hyperons is presented. Finally, we verified that the models satisfying the neutron star maximum mass constraint do not observe the squared sound velocity bound; namely, v(s)(2) < 1/3, corroborating recent findings. However, the recently proposed sigma-cut scheme can make the RMF models consistent with both constraints, depending on the isoscalar-vector interaction of each parametrization. (AU)

FAPESP's process: 13/26258-4 - Superdense matter in the universe
Grantee:Manuel Máximo Bastos Malheiro de Oliveira
Support type: Research Projects - Thematic Grants