Dynamics of spherical charged dust shells in de Sitter space

TL;DR

This paper investigates the complex dynamics of charged dust shells in de Sitter space, revealing new orbit types, bounce phenomena, and bubble solutions involving spontaneous creation and annihilation of charged configurations.

Contribution

It extends known solutions in flat spacetime to de Sitter space, introducing novel shell behaviors and bubble phenomena in a cosmological context.

Findings

Existence of shell orbits into parallel universes

Discovery of bounce solutions before horizon formation

Identification of bubble solutions with spontaneous creation and annihilation

Abstract

We study the dynamics of charged, spherically symmetric dust shells in the presence of a positive cosmological constant. We find generalizations of the well-known solutions in asymptotically flat spacetime, in particular orbits into "parallel universes", but also new solutions corresponding to a "bounce" of the shell before an event horizon has formed. We also discuss "bubble" solutions, in which a charged shell and an oppositely charged singularity are spontaneously created and annihilated.