Charged Gravastars with Casimir Energy in Quadratic f(T) Gravity
Abstract
We investigate a charged gravastar configuration in the framework of modified teleparallel gravity, considering the quadratic form f(T)=T+αT2 and incorporating Casimir vacuum energy as a source for the interior region. The gravastar is constructed as a three-region configuration consisting of a Casimir-energy dominated vacuum interior, an intermediate thin shell of ultra-relativistic matter satisfying the equation of state p=ρ, and an exterior Reissner-Nordstrom spacetime. The modified field equations are derived for a static, spherically symmetric geometry, and the interior and shell solutions are obtained by incorporating the contributions of Casimir energy and the electromagnetic field. The matching between the interior and exterior geometries is performed using the Israel-Darmois junction conditions, from which the surface energy density and pressure of the shell are determined. We examine the physical properties of the configuration through the proper length, shell energy, and entropy. The influence of the charge parameter on these quantities is also investigated. The resulting profiles remain finite and smooth across the shell, while the proper length, energy, and entropy exhibit regular behaviour with increasing shell thickness. The model provides a framework for studying the interplay between quantum vacuum effects, electric charge, and torsional modifications of gravity in compact-object configurations.
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BibTeX
@misc{harshitha2026charged,
title = {{Charged Gravastars with Casimir Energy in Quadratic f(T) Gravity}},
author = {S. R. Harshitha and C. S. Varsha and V. Venkatesha and Phalaksha Murthy B},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.00706},
eprint = {2611.00706},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.00706},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Charged Gravastars with Casimir Energy in Quadratic f(T) Gravity
AU - S. R. Harshitha
AU - C. S. Varsha
AU - V. Venkatesha
AU - Phalaksha Murthy B
PY - 2026
DA - 2026/11/01
PB - arXiv
DO - 10.48550/arxiv.2611.00706
UR - https://arxiv.org/abs/2611.00706
AB - We investigate a charged gravastar configuration in the framework of modified teleparallel gravity, considering the quadratic form f(T)=T+αT^2 and incorporating Casimir vacuum energy as a source for the interior region. The gravastar is constructed as a three-region configuration consisting of a Casimir-energy dominated vacuum interior, an intermediate thin shell of ultra-relativistic matter satisfying the equation of state p=ρ, and an exterior Reissner-Nordstrom spacetime. The modified field equations are derived for a static, spherically symmetric geometry, and the interior and shell solutions are obtained by incorporating the contributions of Casimir energy and the electromagnetic field. The matching between the interior and exterior geometries is performed using the Israel-Darmois junction conditions, from which the surface energy density and pressure of the shell are determined. We examine the physical properties of the configuration through the proper length, shell energy, and entropy. The influence of the charge parameter on these quantities is also investigated. The resulting profiles remain finite and smooth across the shell, while the proper length, energy, and entropy exhibit regular behaviour with increasing shell thickness. The model provides a framework for studying the interplay between quantum vacuum effects, electric charge, and torsional modifications of gravity in compact-object configurations.
ER -