On the formalism of dark energy accretion onto black- and worm-holes

TL;DR

This paper develops a formalism for dark energy accretion onto black holes and wormholes, showing conditions under which singularities can be avoided via a big trip in higher-dimensional models.

Contribution

It introduces a general formalism for dark energy accretion onto astronomical objects and analyzes conditions for singularity avoidance in higher-dimensional models.

Findings

Singularities with diverging Hubble parameter can be avoided by a big trip in models with four or more dimensions.

In models with more than four dimensions, the evolution depends on specific model assumptions.

No coupling between bulk and the accreting object allows for singularity avoidance.

Abstract

In this work a general formalism for the accretion of dark energy onto astronomical objects, black holes and wormholes, is considered. It is shown that in models with four dimensions or more, any singularity with a divergence in the Hubble parameter may be avoided by a big trip, if it is assumed that there is no coupling between the bulk and this accreting object. If this is not the case in more than four dimensions, the evolution of the cosmological object depends on the particular model.