Black Hole Field Theory with a Firewall in two spacetime dimensions

TL;DR

This paper models a modified vacuum state around a black hole in two dimensions, showing that free-fallers encounter a firewall due to high-energy photon correlations, challenging traditional black hole horizon physics.

Contribution

It introduces a modified Unruh vacuum in (1+1) dimensions that predicts a firewall effect for free-fallers near black hole horizons.

Findings

Free-fallers detect unbounded high-energy photons at the horizon.

Modified vacuum state allows for information leakage at high frequencies.

The model suggests a firewall phenomenon in two-dimensional black hole scenarios.

Abstract

We propose that the vacuum state of a scalar field around a black hole is a modified Unruh vacuum. In (1+1) dimensions, we show that a free-faller close to such an horizon can be modelled as an inertial observer in a modified Minkowski vacuum. The modification allows for information-leaking correlations at high frequencies. Using a Gaussian detector centred at $k_0$, we find that the expectation value of the number operator for a detector crossing the horizon is proportional to $1/|k_0|$, implying that the free-faller will observe unbounded numbers of high energy photons, i.e. a firewall.