Reflection on event horizon for collapsing black holes

TL;DR

This paper demonstrates that the phenomenon of particle reflection at the event horizon, previously studied in eternal black holes, also occurs in collapsing black holes, indicating a broader applicability of this effect.

Contribution

It extends the understanding of horizon reflection effects from eternal to collapsing black holes, showing the phenomenon's generality.

Findings

Reflection effect exists for collapsing black holes

Particle bounce-back occurs at the event horizon

Effect previously known only for eternal black holes

Abstract

It was argued recently that there exists an unexpected phenomenon, the reflection of incoming particles on the event horizon of black holes (Kuchiev(2003)). This means that a particle approaching the black hole can bounce back into the outside world due to those events that take part strictly on the horizon. Previously the effect was discussed in relation to eternal black holes. The present work shows that the effect exists for collapsing black holes as well.