Blast freezing a black hole
The paper introduces a solvable evaporation model built from coupled SYK systems: an initially two-sided black hole is coupled at a finite time to a larger, colder bath. In an appropriate large-N and large-p limit, two-point functions and certain four-point probes admit analytic treatment. Boundary correlators determine a generalized HKLL reconstruction of the emergent bulk geometry. Operator size and Rényi-2 mutual information track an infalling excitation. Second Rényi entropy tracks entanglement between the evaporating eta system and the chi bath, including its oscillatory evolution. The…
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