Spherical thin shells with charge in unimodular gravity
Abstract
We construct spherically symmetric thin shells in unimodular gravity (UG) and analyze their dynamical stability under radial, symmetry-preserving perturbations. We use the UG junction conditions and adopt non-conservative charged exterior solutions sourced by a radial electric field. As an application, we build charged vacuum bubbles: a Minkowski interior surrounded by a charged thin shell and matched to an exterior UG geometry. The resulting spacetimes are free of event horizons and central singularities, while in de Sitter-like cases a cosmological horizon may exist outside the shell. We compare the stability regions and the matter content with their counterparts in general relativity, finding some differences controlled by the UG non-conservation parameter. This work extends previously published results.
Versions
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BibTeX
@misc{bengochea2026spherical,
title = {{Spherical thin shells with charge in unimodular gravity}},
author = {Gabriel R. Bengochea and Ernesto F. Eiroa and Griselda Figueroa-Aguirre},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.39664},
eprint = {2609.39664},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.39664},
}
RIS
TY - UNPB
TI - Spherical thin shells with charge in unimodular gravity
AU - Gabriel R. Bengochea
AU - Ernesto F. Eiroa
AU - Griselda Figueroa-Aguirre
PY - 2026
DA - 2026/09/30
PB - arXiv
DO - 10.48550/arxiv.2609.39664
UR - https://arxiv.org/abs/2609.39664
AB - We construct spherically symmetric thin shells in unimodular gravity (UG) and analyze their dynamical stability under radial, symmetry-preserving perturbations. We use the UG junction conditions and adopt non-conservative charged exterior solutions sourced by a radial electric field. As an application, we build charged vacuum bubbles: a Minkowski interior surrounded by a charged thin shell and matched to an exterior UG geometry. The resulting spacetimes are free of event horizons and central singularities, while in de Sitter-like cases a cosmological horizon may exist outside the shell. We compare the stability regions and the matter content with their counterparts in general relativity, finding some differences controlled by the UG non-conservation parameter. This work extends previously published results.
ER -