Holography of the BTZ Black Hole, Inside and Out
Anton de la Fuente, Raman Sundrum

TL;DR
This paper develops a dual CFT framework for the BTZ black hole, including regions beyond the singularity, and demonstrates how boundary correlators can probe the black hole interior within a consistent quantum gravity setting.
Contribution
It introduces a novel dual structure for BTZ black holes incorporating 'whisker' regions and shows how boundary correlators can access the interior physics.
Findings
Boundary correlators in whisker regions are protected and well-defined.
Correlators describe physics inside the horizon but outside the singularity.
The approach provides a non-perturbative CFT perspective on black hole singularities.
Abstract
We propose a 1+1 dimensional CFT dual structure for quantum gravity and matter on the extended 2+1 dimensional BTZ black hole, realized as a quotient of the Poincare patch of AdS. The quotient spacetime includes regions beyond the singularity, "whiskers", containing timelike and lightlike closed curves, which at first sight seem unphysical. The spacetime includes the usual AdS-asymptotic boundaries outside the horizons as well as boundary components inside the whiskers. We show that local boundary correlators with some endpoints in the whisker regions: (i) are a protected class of amplitudes, dominated by effective field theory even when the associated Witten diagrams appear to traverse the singularity, (ii) describe well-defined diffeomorphism-invariant quantum gravity amplitudes in BTZ, (iii) sharply probe some of the physics inside the horizon but outside the singularity, and…
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