Observability of Quantum State of Black Hole

TL;DR

This paper demonstrates that by carefully choosing probes, one can extract the quantum state of a black hole from scattering experiments, revealing its internal information without proximity.

Contribution

It introduces a method to read off black hole quantum states from the S-matrix using high-energy probes, linking scattering data to internal quantum information.

Findings

Black hole quantum states can be inferred from scattering data.

Appropriate probes allow reading internal black hole information asymptotically.

Scattering interpreted as off classical stringy backgrounds dependent on black hole quantum numbers.

Abstract

We analyze terms subleading to Rutherford in the $S$-matrix between black hole and probes of successively high energies. We show that by an appropriate choice of the probe one can read off the quantum state of the black hole from the S-matrix, staying asymptotically far from the BH all the time. We interpret the scattering experiment as scattering off classical stringy backgrounds which explicitly depend on the internal quantum numbers of the black hole.