Generic thin-shell gravastars

TL;DR

This paper develops a general framework for constructing and analyzing spherically symmetric thin-shell gravastars, exploring their internal physics, stability, and dynamic behaviors, including special cases with zero surface energy density.

Contribution

It provides a unified, general method for modeling thin-shell gravastars, analyzing both their internal physics and interactions with external spacetime forces.

Findings

Stable static configurations with zero surface energy density and nonzero surface tension

Dynamic bounded excursion configurations analyzed for stability

Generalized approach applicable to various gravastar models

Abstract

We construct generic spherically symmetric thin-shell gravastars by using the cut-and-paste procedure. We take considerable effort to make the analysis as general and unified as practicable; investigating both the internal physics of the transition layer and its interaction with "external forces" arising due to interactions between the transition layer and the bulk spacetime. Furthermore, we discuss both the dynamic and static situations. In particular, we consider "bounded excursion" dynamical configurations, and probe the stability of static configurations. For gravastars there is always a particularly compelling configuration in which the surface energy density is zero, while surface tension is nonzero.