Gravastars in a non-minimally coupled gravity with electromagnetism

• Published in: The European physical journal. C, Particles and fields Vol. 81; no. 11; pp. 1 - 7
• Main Authors: Sert, Özcan, Adak, Muzaffer
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-11-2021; Springer; Springer Nature B.V; SpringerOpen
• Subjects: Accretion disks; Analysis; Astronomy; Astrophysics and Cosmology; Black holes; Dark energy; Electromagnetism; Elementary Particles; Exact solutions; Geometry; Gravitational fields; Gravity; Hadrons; Heavy Ions; Lagrange multiplier; Mathematical models; Measurement Science and Instrumentation; Nuclear Energy; Nuclear Physics; Parameters; Phase transitions; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Red shift; Regular Article - Theoretical Physics; String Theory; Theoretical physics
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-021-09804-3

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–Nordström 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,
β
, in the second model.