GR and closeness to a black hole singularity

[Randy Subers]

TL;DR

GR and closeness to a black hold singularity

Assume a Schwarzschild black hole. Near the event horizon other than Hawking radiation the behavior of matter and energy are fairly accuratly described by general relativity. How close can one get to the center (the singularity based on GR) before one must switch to a quantum gravity theory to provide accurate predictions?

 

[Demystifier]

Nobody knows for sure. According to some theories (firewall, fuzzball, energetic curtain), quantum gravity has dramatic consequences already at the horizon. I have proposed a theory in which there is a quantum gravity core which grows as black hole shrinks due to evaporation: https://arxiv.org/abs/1505.04088