Dynamics of false vacuum bubbles with nonminimal coupling

TL;DR

This paper investigates the behavior of false vacuum bubbles influenced by a nonminimally coupled scalar field, revealing conditions for their expansion without initial singularities and diverse external geometries.

Contribution

It introduces a model of false vacuum bubble dynamics with nonminimal coupling, highlighting negative tension effects and non-singular expanding solutions.

Findings

False vacuum bubbles can expand without initial singularities.

External geometry of bubbles varies with vacuum energy.

Nonminimal coupling induces negative tension effects.

Abstract

We study the dynamics of false vacuum bubbles. A nonminimally coupled scalar field gives rise to the effect of negative tension. The mass of a false vacuum bubble from outside observer's point of view can be positive, zero, or negative. The interior false vacuum has de Sitter geometry, while the exterior true vacuum background can have geometry depending on the vacuum energy. We show that there exist expanding false vacuum bubbles without the initial singularity in the past.