The spherical symmetry Black hole collapse in expanding universe

Understand

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.