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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.)

Neutron star crustal properties from relativistic mean-field models and bulk parameters effects

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Author(s):
Dutra, M. [1] ; Lenzi, C. H. [1] ; de Paula, W. [1] ; Lourenco, O. [1]
Total Authors: 4
Affiliation:
[1] Inst Tecnol Aeronaut, DCTA, Dept Fis, BR-12228900 Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: EUROPEAN PHYSICAL JOURNAL A; v. 57, n. 8 AUG 2021.
Web of Science Citations: 0
Abstract

We calculate crustal properties of neutron stars, namely, mass (M-crust), radius (R-crust) and fraction of moment of inertia (Delta I/I) from parametrizations of hadronic relativistic mean-field (RMF) model consistent with symmetric and asymmetric nuclear matter constraints, as well as some stellar boundaries. We verify which one are also in agreement with restrictions of Delta I/I >= 1.4% and Delta I/I >= 7% related to the glitching mechanism observed in pulsars, such as the Vela one. The latter constraint explains the glitches phenomenon when entrainment effects are taken into account. Our findings indicate that these parametrizations pass in the glitching limit for a neutron star mass range of M <= 1.82 M-circle dot (Delta I/I >= 1.4%), and M <= 1.16 M-circle dot (Delta I/I >= 7%). We also investigate the influence of nuclear matter bulk parameters on crustal properties and find that symmetry energy is the quantity that produces the higher variations on Mcrust, Rcrust, and Delta I/I. Based on the results, we construct a particular RMF parametrization able to satisfy Delta I/I >= 7% even at M = 1.4 M-circle dot, the mass value used to fit data from the softer component of the Vela pulsar X-ray spectrum. The model also presents compatibility with observational data from PSR J1614-2230, PSR J0348 + 0432, and MSP J0740 + 6620 pulsars, as well as, with data from the Neutron Star Interior Composition Explorer (NICER) mission. (AU)

FAPESP's process: 20/05238-9 - Different approaches in the strongly interacting matter study
Grantee:Odilon Lourenço da Silva Filho
Support Opportunities: Regular Research Grants
FAPESP's process: 17/05660-0 - Theoretical studies of the structure and reactions of exotic nuclei and many-body systems
Grantee:Brett Vern Carlson
Support Opportunities: Research Projects - Thematic Grants