发表机构
Instituto de Astronomía y Física del Espacio (IAFE, CONICET-UBA)（太空物理与天文学研究所（IAFE，CONICET-UBA））
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文在单模引力中构造带电球对称薄壳，分析其径向扰动稳定性，构建无奇点的带电真空泡，并与广义相对论比较，发现非守恒参数导致的差异。
AI 中文摘要
我们在单模引力（UG）中构造了球对称薄壳，并分析了它们在径向、保持对称性的扰动下的动力学稳定性。我们采用UG的衔接条件，并采用由径向电场驱动的非守恒带电外部解。作为应用，我们构建了带电真空泡：一个闵可夫斯基内部被带电薄壳包围，并与外部UG几何匹配。所得时空没有事件视界和中心奇点，而在类德西特情形下，壳外可能存在宇宙学视界。我们将稳定性区域和物质含量与广义相对论中的对应情况进行了比较，发现了一些由UG非守恒参数控制的差异。这项工作扩展了先前发表的结果。
英文摘要
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.
Comments10 pages, 4 figures; Proceedings of the 2nd Workshop on Matter, Astrophysics, Gravitation, Ions and Cosmology (MAGIC 2025)
Journal refAstron. Nachr. 347, e70139 (2026)
