Charged gravastars in higher dimensions

TL;DR

This paper investigates a new model of charged gravastars in higher-dimensional Einstein-Maxwell spacetime, analyzing their structure, junction conditions, and physical viability, while questioning the applicability of higher dimensions for such objects.

Contribution

It introduces a higher-dimensional charged gravastar model with distinct regions and derives its physical properties and junction conditions, extending previous 4D models.

Findings

Model satisfies physical requirements

Higher-dimensional approach may not be applicable from 4D perspective

Outer region matches higher-dimensional Reissner-Nordström black hole

Abstract

We explore possibility to find out a new model of gravastars in the extended $D$-dimensional Einstein-Maxwell spacetime. The class of solutions as obtained by Mazur and Mottola of a neutral gravastar \cite{Mazur2001,Mazur2004} have been observed as an alternative to $D$-dimensional versions of the Schwarzschild-Tangherlini black hole. To tackle the spherical system in a convenient way we have configured that the gravastar consists of three distinct regions with different equations of state as follows: [I] Interior region $0 \leq r < r_1$,$\rho = -p$, [II] Thin shell region $r_1 \leq r < r_2$,$\rho = p$, and [III] Exterior region $r_2 < r$,$\rho = p =0$. The outer region of this gravastar model therefore corresponds to a higher dimensional Reissner-Nordstr{\"o}m black hole. In connection to this junction conditions are provided and therefore we have formulated mass and the related Equation of State of the gravastar. It has been shown that the model satisfies all the requirements of the physical features. However, overall observational survey of the results also provide probable indication of non-applicability of higher dimensional approach for construction of a gravastar with or without charge from an ordinary $4$-dimensional seed as far as physical ground is concerned.