# Non-linear stability of a brane wormhole

## TL;DR

This paper analytically investigates the non-linear stability of a spherically symmetric brane-supported wormhole when disturbed by a falling dust shell, considering gravitational interactions and collision effects.

## Contribution

It provides a new analytical framework for assessing the non-linear stability of brane wormholes under gravitational disturbances.

## Key findings

- Identifies conditions for wormhole stability after dust shell traversal.
- Shows the collision with the dust shell affects wormhole stability.
- Accounts for self-gravity of falling matter using Israel's formalism.

## Abstract

We analytically study the non-linear stability of a spherically symmetric wormhole supported by an infinitesimally thin brane of negative tension, which has been devised by Barcelo and Visser. We consider a situation in which a thin spherical shell composed of dust falls into an initially static wormhole; The dust shell plays a role of the non-linear disturbance. The self-gravity of the falling dust shell is completely taken into account through Israel's formalism of the metric junction. When the dust shell goes through the wormhole, it necessarily collides with the brane supporting the wormhole. We assume the interaction between these shells is only gravity and show the condition under which the wormhole stably persists after the dust shell goes through it.