Gravastars in a Non-minimally Coupled Gravity with Electromagnetism

Abstract

In this paper we investigate the gravitational vacuum stars which called gravastars in the non-minimally coupled models with electromagnetic and gravitational fields. We consider two non-minimal models and find the corresponding spherically symmetric exact solutions in the interior of the star consisting of the dark energy condensate. Our models turn out to be Einstein-Maxwell model at the outside of the star and the solutions become the Reissner-Nordstr{ö}m solution. The physical quantities of these models are continuous and non-singular in some range of parameters and the exterior geometry continuously matches with the interior geometry at the surface. We calculate the matter mass, the total gravitational mass, the electric charge and redshift of the star for the two models. We notice that these quantities except redshift are dependent of a subtle free parameter, $k$, of the model. We also remark a wide redshift range from zero to infinity depending on one free parameter, $\beta$, in the second model.

16 pages

References in corpus (19)

• f(R,T) gravity
• Cosmological viability of f(R)-gravity as an ideal fluid and its compatibility with a matter dominated phase
• The Sloan Digital Sky Survey Quasar Catalog: Sixteenth Data Release
• A Luminous Quasar at Redshift 7.642
• Future of the universe in modified gravitational theories: Approaching to the finite-time future singularity
• Bounds on the basic physical parameters for anisotropic compact general relativistic objects
• Inflation and late-time cosmic acceleration in non-minimal Maxwell-$F(R)$ gravity and the generation of large-scale magnetic fields
• Charged gravastars admitting conformal motion
• Gravastars supported by nonlinear electrodynamics
• Can accretion disk properties distinguish gravastars from black holes?
• Electrically charged gravastar configurations
• Exact dark energy star solutions
• Non-minimal $\ln (R)F^2$ Couplings of Electromagnetic Fields to Gravity: Static, Spherically Symmetric Solutions
• Stable and self consistent charged gravastar model within the framework of $f(R,T)$ gravity
• Incompressible relativistic spheres: Electrically charged stars, compactness bounds, and quasiblack hole configurations
• Non-minimally Coupled Gravitational and Electromagnetic Fields: pp-Wave Solutions
• Resolving the Radio Emission from the Quasar P172+18 at $z=6.82$
• Radiation Fluid Stars in the Non-minimally Coupled $Y(R)F^2$ Gravity
• Electromagnetic Duality and New Solutions of the Non-minimally Coupled Y(R)-Maxwell Gravity