Quark stars with 2.6 in a non-minimal geometry-matter coupling theory of gravity

G. A. Carvalho; R. V. Lobato; D. Deb; P. H. R. S. Moraes; M. Malheiro

doi:10.1140/epjc/s10052-022-11058-6

2021 Impact factor 4.991

Particles and Fields

Open Access

Eur. Phys. J. C (2022) 82: 1096
https://doi.org/10.1140/epjc/s10052-022-11058-6

Regular Article - Theoretical Physics

Quark stars with 2.6 in a non-minimal geometry-matter coupling theory of gravity

G. A. Carvalho¹^a, R. V. Lobato²^,3, D. Deb⁴^,5, P. H. R. S. Moraes⁶ and M. Malheiro⁷

¹ Departamento de Física, Universidade Tecnológica Federal do Paraná, Medianeira, PR, Brazil
² Departamento de Física, Universidad de los Andes, Bogotá, Colombia
³ Departament of Physics and Astronomy, Texas A &M University, 75428, Commerce, TX, USA
⁴ Department of Physics, Indian Institute of Science, 560012, Bangalore, India
⁵ The Institute of Mathematical Sciences, CIT Campus, Taramani, 600113, Chennai, Tamil Nadu, India
⁶ Universidade Federal do ABC (UFABC)-Centro de Ciências Naturais e Humanas (CCNH), Avenida dos Estados 5001, 09210-580, Santo André, SP, Brazil
⁷ Instituto Tecnológico de Aeronáutica (ITA), 12228-900, São José dos Campos, SP, Brazil

^a gacarvalho@utfpr.edu.br

Received: 21 September 2022
Accepted: 20 November 2022
Published online: 6 December 2022

Abstract

This work analyses the hydrostatic equilibrium configurations of strange stars in a non-minimal geometry-matter coupling (GMC) theory of gravity. Those stars are made of strange quark matter, whose distribution is governed by the MIT equation of state. The non-minimal GMC theory is described by the following gravitational action: , where R represents the curvature scalar, L is the matter Lagrangian density, and is the coupling parameter. When considering this theory, the strange stars become larger and more massive. In particular, when km, the theory can achieve the 2.6 , which is suitable for describing the pulsars PSR J2215+5135 and PSR J1614-2230, and the mass of the secondary object in the GW190814 event. The 2.6 is a value hardly achievable in General Relativity, even considering fast rotation effects, and is also compatible with the mass of PSR J0952-0607 (), the heaviest and fastest pulsar in the disk of the Milky Way, recently measured, supporting the possible existence of strange quark matter in its composition. The non-minimal GMC theory can also give feasible results to describe the macroscopical features of strange star candidates.

© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.