Regular Article - Theoretical Physics
Massive white dwarfs in gravity
Departamento de Fisica, Universidad de los Andes, Bogotá, Colombia
2 Department of Physics and Astronomy, Texas A &M University-Commerce, 75429, Commerce, TX, USA
3 Departamento de Física, Universidade Tecnológica Federal do Paraná, Medianeira, PR, Brazil
4 Instituto de Pesquisa e Desenvolvimento (IP &D), Universidade do Vale do Paraíba, 12244-000, São José dos Campos, SP, Brazil
Accepted: 3 June 2022
Published online: 18 June 2022
In this work, we investigate the equilibrium configurations of massive white dwarfs (MWD) in the context of modified gravity, namely gravity, where stands for the Ricci scalar and is the Lagrangian matter density. We focused on the specific case , i.e., we have considered a non-minimal coupling between the gravity field and the matter field, with being the coupling constant. For the first time, the theory is applied to white dwarfs, in particular to study massive white dwarfs, which is a topic of great interest in the last years. The equilibrium configurations predict maximum masses which are above the Chandrasekhar mass limit. The most important effect of the theory is to increase significantly the mass for stars with radius < 2000 km. We found that the theory can accommodate the super-Chandrasekhar white dwarfs for different star compositions. Apart from this, the theory recovers the General Relativity results for stars with radii larger than 3000 km, independent of the value of .
© The Author(s) 2022
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