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Decoding the Apparent Horizon: A Coarse-Grained Holographic Entropy
Netta Engelhardt, Aron C. Wall
When a black hole forms from collapse in a holographic theory, the information in the black hole interior remains encoded in the boundary. We prove that the area of the black hole'…
Locality from Quantum Gravity: All or Nothing
Netta Engelhardt, Sebastian Fischetti
In a full theory of quantum gravity, local physics is expected to be approximate rather than innate. It is therefore important to understand how approximate locality emerges in the…
Causal Density Matrices
Netta Engelhardt, Sebastian Fischetti
We define a new construct in quantum field theory - the causal density matrix - obtained from the singularity structure of correlators of local operators. This object provides a ne…
No Simple Dual to the Causal Holographic Information?
Netta Engelhardt, Aron C. Wall
In AdS/CFT, the fine grained entropy of a boundary region is dual to the area of an extremal surface X in the bulk. It has been proposed that the area of a certain 'causal surface'…