Regular Article - Theoretical Physics
Quark stars with 2.6 in a non-minimal geometry-matter coupling theory of gravity
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
Accepted: 20 November 2022
Published online: 6 December 2022
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.
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