Detecting black hole microstates

Key Points

Microstates of an asymptotically AdS black hole can be detected through the Euclidean two-point function of a specific probe operator, transforming our understanding of gravity.
The new gravitational saddle overpowers traditional saddles, achieving a breakthrough in this detection method; this approach depends on careful tuning of the probe operator.
The findings can be validated in the dual boundary conformal field theory (CFT) by applying the eigenstate thermalization hypothesis for strong correspondence.
A binary search protocol is introduced, allowing for more efficient detection of black hole microstates from a pre-selected candidate list.

Abstract

We demonstrate that the Euclidean two-point function of an appropriately chosen probe operator can detect the microstate of an asymptotically AdS black hole. This detection, which requires a tuned, state-dependent choice of probe, is the result of a new gravitational saddle, which dominates over the usual saddles. The gravitational result can be explicitly reproduced in the dual boundary CFT if we assume the eigenstate thermalization hypothesis. We also discuss a binary search protocol to detect the black hole microstate from a candidate list.

Detecting black hole microstates

Key Points

Abstract

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