Classifying boundary conditions in JT gravity: from energy-branes to $\alpha$-branes

Abstract

We classify the possible boundary conditions in JT gravity and discuss their exact quantization. Each boundary condition that we study will reveal new features in JT gravity related to its matrix integral interpretation, its factorization properties and ensemble averaging interpretation, the definition of the theory at finite cutoff, its relation to the physics of near-extremal black holes and, finally, its role as a two-dimensional model of cosmology.

arXiv comment65 pages, 6 figures; v2: published version

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• An integrable road to a perturbative plateau
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