Is the Black Hole Complementarity principle really necessary?

TL;DR

This paper argues that the black hole complementarity principle may not be necessary by demonstrating that the S-matrix approach leads to a semi-classical metric where infalling particles do not cross the horizon but reach null infinity.

Contribution

It challenges the necessity of the black hole complementarity principle by deriving a semi-classical metric from the S-matrix ansatz.

Findings

Infalling particles do not cross the horizon in the semi-classical metric.

Particles reach null infinity instead of the singularity.

The S-matrix approach implies a different horizon behavior.

Abstract

We show that the S-matrix ansatz implies a semi-classical metric such that a freely falling test particle will not cross the horizon in its proper time. Instead of reaching the singularity it will reach ${\cal I^{+}}$.