From black holes to baby universes in CGHS gravity

Understand

We study $\widehat{\text{CGHS}}$ gravity, a variant of the matterless Callan-Giddings-Harvey-Strominger model.

• We show that it describes a universal sector of the near horizon perturbations of non-extremal black holes in higher dimensions.
• In many respects this theory can be viewed as a flat space analog of Jackiw-Teitelboim gravity.
• The result for the Euclidean path integral implies that $\widehat{\text{CGHS}}$ is dual to a Gaussian ensemble that we describe in detail.