Testing of K(R,T)-gravity through gravastar configurations

TL;DR

This paper demonstrates the existence of gravastar configurations within K(R,T)-gravity, an alternative to black holes, by developing field equations, analyzing models, and examining physical properties of these structures.

Contribution

First to establish gravastar solutions in K(R,T)-gravity, exploring their physical feasibility and characteristics across different models.

Findings

Two models yield physically feasible gravastar solutions.

Interior solutions are regular everywhere regardless of K(R,T) form.

Junction conditions determine surface properties at interfaces.

Abstract

In this article, we are reporting for the first time the existence of gravastar configurations in the framework of K(R,T)-gravity, which can be treated as an alternative to a black hole (Mazur and Mottola). This strengthens how much this new gravity theory may be physically demanding to the gravity community in the near future. We first develop the gravastar field equations for a generic K(R,T) functional and then we study four different models within this theory. We find that the solutions for the interior region are regular everywhere regardless of the exact form of the K(R,T) functional. The solutions for the shell region indicate that two of the four models subjected to the study are physically feasible. In addition, the junction conditions are considered at each interface by using the Lanczos equations that yield the surface density and pressure at the thin shell. We investigate various characteristics of the gravastar structure such as the proper length, energy, and entropy of the spherical distribution.