Possible types of the evolution of vacuum shells around the de Sitter space

TL;DR

This paper classifies all possible evolution scenarios of thin vacuum shells around de Sitter space, revealing how these configurations can lead to black holes, wormholes, or expansion depending on initial conditions.

Contribution

It provides a comprehensive analysis and construction of all potential global geometries for vacuum shells in de Sitter space, relevant to cosmological phase transitions.

Findings

Configurations can lead to black holes or wormholes.

Shell evolution depends on size, density, and velocity.

All possible global geometries have been classified.

Abstract

All possible evolution scenarios of a thin vacuum shell surrounding the spherically symmetric de Sitter space have been determined and the corresponding global geometries have been constructed. Such configurations can appear at the final stage of the cosmological phase transition, when isolated regions (islands) of the old vacuum remain. The islands of the old vacuum are absorbed by the new vacuum, expand unlimitedly, or form black holes and wormholes depending on the sizes of the islands as well as on the density and velocity of the shells surrounding the islands.