Charged quark stars in metric f(R) gravity

Juan M.Z. Pretel, José D.V. Arbañil, Sergio B. Duarte, Sergio E Jorás, Ribamar R.R. Reis

Research output: Contribution to journalArticlepeer-review

Abstract

We provide the modified TOV equations for the hydrostatic equilibrium of charged compact stars within the metric f(R) gravitational background. We adopt the MIT bag model EoS for the dense matter and assume a charge distribution where the electric charge density ρ ch is proportional to the standard energy density ρ. Using the Starobinsky model, we explore the role of the αR 2 term, where α is a free constant and R the Ricci scalar, on the global properties of charged stars such as radius, mass and total charge. We present the dependence of the structure of the star for several values of α and for different values of the constant parameter β ≡ ρ ch/ρ. Remarkably, we find that the radius decreases with respect to its GR value for low central densities, while the opposite occurs in the high-central-density region. The mass measured at the surface always decreases and the maximum-total charge undergoes a substantial increase as the parameter α increases. We also illustrate the variations of the asymptotic mass as a consequence of the electric charge and the extra quadratic term.

Original languageEnglish
Article number058
JournalJournal of Cosmology and Astroparticle Physics
Volume2022
Issue number9
DOIs
StatePublished - 1 Sep 2022
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2022 IOP Publishing Ltd and Sissa Medialab.

Keywords

  • modified gravity
  • stars

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