Measuring the Black Hole Interior from the Exterior
arXiv:2505.09878 · doi:10.1142/S0218271825440067
Abstract
In this essay, we argue that an observer outside the horizon can reconstruct the geometry of a black hole's interior through external measurements. This procedure builds on recent studies of the holographic duality of timelike entanglement entropy and its connection to spacelike entanglement entropy. Furthermore, we propose that this phenomenon reveals a fundamental correlation between the degrees of freedom inside and outside the black hole at the level of classical spacetime.
Honorable Mention in the 2025 Gravity Research Foundation Essay Competition
References in corpus (16)
- Holographic Derivation of Entanglement Entropy from AdS/CFT
- A Covariant Holographic Entanglement Entropy Proposal
- Eternal Black Holes in AdS
- The Stretched Horizon and Black Hole Complementarity
- Replica Wormholes and the Entropy of Hawking Radiation
- Quantum Extremal Surfaces: Holographic Entanglement Entropy beyond the Classical Regime
- Time Evolution of Entanglement Entropy from Black Hole Interiors
- The entropy of Hawking radiation
- Reconstruction of Bulk Operators within the Entanglement Wedge in Gauge-Gravity Duality
- Relative entropy equals bulk relative entropy
- The Gravity Dual of a Density Matrix
- Black Hole Evaporation without Information Loss
- The Black Hole Singularity in AdS/CFT
- Pseudo Entropy in dS/CFT and Time-like Entanglement Entropy
- Extremal Surface Barriers
- Geometric Interpretation of Timelike Entanglement Entropy