Electrically charged quark stars in 4D Einstein–Gauss–Bonnet gravity

Juan M. Z. Pretel; Ayan Banerjee; Anirudh Pradhan

doi:10.1140/epjc/s10052-022-10123-4

2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2022) 82: 180
https://doi.org/10.1140/epjc/s10052-022-10123-4

Regular Article - Theoretical Physics

Electrically charged quark stars in 4D Einstein–Gauss–Bonnet gravity

Juan M. Z. Pretel¹^a, Ayan Banerjee² and Anirudh Pradhan³

¹ Instituto de Física, Universidade Federal do Rio de Janeiro, CEP 21941-972, Rio de Janeiro, RJ, Brazil
² Astrophysics and Cosmology Research Unit, School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, Private Bag X54001, 4000, Durban, South Africa
³ Centre for Cosmology, Astrophysics and Space Science, GLA University, 281 406, Mathura, Uttar Pradesh, India

^a juanzarate@if.ufrj.br

Received: 15 October 2021
Accepted: 10 February 2022
Published online: 25 February 2022

Abstract

In this work we study the properties of compact spheres made of a charged perfect fluid with a MIT bag model EoS for quark matter. Considering static spherically symmetric spacetime we derive the hydrostatic equilibrium equations in the recently formulated four dimensional Einstein–Gauss–Bonnet (4D EGB) gravity theory. In this setting, the modified TOV equations are solved numerically with the aim to investigate the impact of electric charge on the stellar structure. A nice feature of 4D EGB theory is that the Gauss–Bonnet term has a non-vanishing contribution to the gravitational dynamics in 4D spacetime. We therefore analyse the effects of Gauss–Bonnet coupling constant $α$ $\alpha$ and the charge fraction $β$ $\beta$ on the mass–radius ( $M - R$ $$M{-}R$$ ) diagram and also the mass–central density $(M - ρ_{c})$ $(M{-}\rho _c)$ relation of quark stars. Finally, we conclude that depending on the choice of coupling constant one could have larger mass and radius compared with GR and can also be relevant for more massive compact objects due to the effect of the repulsive Coulomb force.

© The Author(s) 2022

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