Impact of charge on gravastars in f(ℜ,𝒯2) gravity
Abstract
This paper studies the influence of charge on a compact stellar structure also regarded as vacuum condensate star in the background of f(ℜ,𝒯2) gravity. This object is considered the alternate of black hole whose structure involves three distinct regions, i.e. interior, exterior and thinshell. We analyze these domains of a gravastar for a particular model of this modified theory. In the inner region of a gravastar, the considered equation of state defines that energy density is equal to negative pressure which is the cause of repulsive force on the spherical shell. In the intermediate shell, pressure and energy density are equal and contain ultrarelativistic fluid. The inwarddirected gravitational pull of thinshell counterbalances the force exerted by the inner region of a gravastar allowing the formation of a singularityfree object. The ReissnerNordström metric presents the outer vacuum spherical domain. Moreover, we discuss the impact of the charge on physical attributes of a gravastar such as the equation of state parameter, entropy, proper length and energy. We conclude that singularityfree solutions of charged gravastar are physically consistent in this modified theory.
 Publication:

Modern Physics Letters A
 Pub Date:
 April 2022
 DOI:
 10.1142/S0217732322500651
 arXiv:
 arXiv:2208.01400
 Bibcode:
 2022MPLA...3750065S
 Keywords:

 Energy–momentum squared gravity;
 gravastars;
 compact stellar structures;
 04.20.Jb;
 98.35.Ac;
 04.50.Kd;
 Exact solutions;
 Origin formation evolution age and star formation;
 Modified theories of gravity;
 General Relativity and Quantum Cosmology
 EPrint:
 20 pages, 4 figures