Gravastars in a nonminimally coupled gravity with electromagnetism
Abstract
In this paper we investigate the gravitational vacuum stars which called gravastars in the nonminimally coupled models with electromagnetic and gravitational fields. We consider two nonminimal 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 EinsteinMaxwell model at the outside of the star and the solutions become the ReissnerNordström solution. The physical quantities of these models are continuous and nonsingular 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, β , in the second model.
 Publication:

European Physical Journal C
 Pub Date:
 November 2021
 DOI:
 10.1140/epjc/s10052021098043
 arXiv:
 arXiv:2110.11092
 Bibcode:
 2021EPJC...81.1006S
 Keywords:

 General Relativity and Quantum Cosmology;
 High Energy Physics  Theory
 EPrint:
 16 pages