Exchange of signals around the event horizon in Schwarzschild space-time

TL;DR

This paper explores signal exchange and causal structures near the Schwarzschild event horizon, revealing that objects can disintegrate upon crossing the horizon and that the internal arrow of time may differ from external observations.

Contribution

It introduces new scenarios for the causal structure around black holes and shows how extended objects can break apart at the horizon.

Findings

Objects can disintegrate into elementary constituents at the horizon

The internal arrow of time may differ from external observations

Different causal structures are possible around the event horizon

Abstract

Red shift in communication and possibility of interaction is discussed for objects around the event horizon of Schwarzschild space-time. It is pointed out that the arrow of time within the horizon cannot always be inferred by observations carried out outside. Two scenarios are presented for the causal structure of the space-time and it is found that in one of them extended objects fall apart into their elementary constituents by crossing the horizon.