Stability of Thin Shell and Wormhole Configurations: Schwarzschild, Schwarzschild -- (Anti-) de Sitter, and FLRW Spacetimes

TL;DR

This paper investigates the stability of various thin shell wormholes and black hole configurations in different spacetimes, identifying stability regions and demonstrating that all considered wormholes are unstable in the causal region.

Contribution

It provides a comprehensive analysis of the stability of thin shell wormholes and black holes across multiple spacetime geometries, including Schwarzschild, (Anti-) de Sitter, and FLRW, with detailed stability mappings.

Findings

Stability regions depend on mass ratios and throat radii.

All considered wormholes are unstable in the causal region.

A taxonomy of configuration stability features is developed.

Abstract

The stability of thin shell wormholes and black holes to linearized spherically symmetric perturbations about a static equilibrium is analyzed. Thin shell formalism is explored and junctions formed from combinations of Schwarzschild, Schwarzschild - de Sitter, and Schwarzschild - anti-de Sitter, as well as Friedmann-Lemaitre-Robertson-Walker (FLRW) spacetimes are considered. The regions of stability for these different combinations are thoroughly described and plotted as a function of mass ratios of the Schwarzschild masses and radii of the wormhole throats. A taxonomy of the qualitative features of the various configurations and parameter spaces is developed, illustrating the stability regions when present. The considered wormholes are all found to be unstable in the causal region.