Defects in Jackiw-Teitelboim Quantum Gravity

Abstract

We classify and study defects in 2d Jackiw-Teitelboim gravity. We show these are holographically described by a deformation of the Schwarzian theory where the reparametrization mode is integrated over different coadjoint orbits of the Virasoro group. We show that the quantization of each coadjoint orbit is connected to 2d Liouville CFT between branes with insertions of Verlinde loop operators. We also propose an interpretation for the exceptional orbits. We use this perspective to solve these deformations of the Schwarzian theory, computing their partition function and correlators. In the process, we define two geometric observables: the horizon area operator ${\Phi }_h$ and the geodesic length operator $L(\gamma )$. We show this procedure is structurally related to the deformation of the particle-on-a-group quantum mechanics by the addition of a chemical potential. As an example, we solve the low-energy theory of complex SYK with a U(1) symmetry and generalize to the non-abelian case.

66 pages, v4: clarifications added, typos corrected, matches published version

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• Les Houches lectures on two-dimensional gravity and holography
• Quantum group origins of edge states in double-scaled SYK
• Phase space holography with no strings attached
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• Quantum-Corrected Hawking Radiation from Near-Extremal Kerr-Newman Black Holes
• Schwarzian for colored Jackiw-Teitelboim gravity
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• Characters, Coadjoint Orbits and Duistermaat-Heckman Integrals
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