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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.)

Hydrostatic equilibrium configurations of neutron stars in a non-minimal geometry-matter coupling theory of gravity

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Author(s):
Carvalho, G. A. [1, 2] ; Moraes, P. H. R. S. [1, 3] ; dos Santos Jr, I, S. ; Goncalves, B. S. [4] ; Malheiro, M. [4]
Total Authors: 5
Affiliation:
[1] Inst Tecnol Aeronaut, Dept Fis, BR-12228900 Sao Jose Dos Campos, SP - Brazil
[2] Univ Vale Paraiba, Inst Pesquisa & Desenvolvimento IP&D, BR-12244000 Sao Jose Dos Campos, SP - Brazil
[3] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, R Matao 1226, Cidade Univ, BR-05508090 Sao Paulo, SP - Brazil
[4] dos Santos Jr, Jr., S., Inst Tecnol Aeronaut, Dept Fis, BR-12228900 Sao Jose Dos Campos, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: EUROPEAN PHYSICAL JOURNAL C; v. 80, n. 5 MAY 29 2020.
Web of Science Citations: 0
Abstract

In this work we analyze hydrostatic equilibrium configurations of neutron stars in a non-minimal geometry-matter coupling (GMC) theory of gravity. We begin with the derivation of the hydrostatic equilibrium equations for the f(R, L) gravity theory, where R and L are the Ricci scalar and Lagrangian of matter, respectively. We assume f(R,L)=R/2+{[}1+sigma R]L, with sigma constant. To describe matter inside neutron stars we assume a relativistic polytropic equation of state p=K rho(gamma), with rho being the energy density, K and gamma=5/3 being constants. We also consider the more realistic equation of state (EoS) known as SLy4, which is a Skyrme type one based on effective nuclear interaction. We show that in this theory it is possible to reach the mass of massive pulsars, such as PSR J2215 + 5135, for both equations of state. Also, results for mass-radius relation in GMC gravity are strongly dependent on the stiffness of the EoS. (AU)

FAPESP's process: 15/08476-0 - Gravitational waves in f(R,T) theories: polarization states and astrophysical sources
Grantee:Pedro Henrique Ribeiro da Silva Moraes
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 18/20689-7 - Gauss-Bonnet Stars
Grantee:Pedro Henrique Ribeiro da Silva Moraes
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
FAPESP's process: 13/26258-4 - Superdense matter in the universe
Grantee:Manuel Máximo Bastos Malheiro de Oliveira
Support Opportunities: Research Projects - Thematic Grants