The spherical symmetry Black hole collapse in expanding universe

TL;DR

This paper investigates the formation and properties of black holes with spherical symmetry in an expanding universe, focusing on horizons, singularities, and the influence of the cosmological constant.

Contribution

It provides new insights into the conditions for dynamical horizon formation and the effects of the cosmological constant on black hole behavior in cosmological settings.

Findings

Dynamical horizons can form under specific conditions in expanding backgrounds.

The cosmological constant affects the structure and evolution of black holes.

Redshift effects from trapped surfaces are analyzed in this context.

Abstract

The spherical symmetry Black holes are considered in expanding background. The singularity line and the marginally trapped tube surface behavior are discussed. In particular, we address the conditions of whether a dynamical horizon forms for these cosmological black holes. We also discuss the cosmological constant effect on these black holes and the redshift of the light which comes from the marginally trapped tube surface.