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arXiv · 2107.07720

Half-wormholes in nearly AdS$_2$ holography

Antonio M. García-García·Victor Godet
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Abstract

We find half-wormhole solutions in Jackiw-Teitelboim gravity by allowing the geometry to end on a spacetime D-brane with specific boundary conditions. This theory also contains a Euclidean wormhole which leads to a factorization problem. We propose that half-wormholes provide a gravitational picture for how factorization is restored and show that the Euclidean wormhole emerges from averaging over the boundary conditions. The wormhole is known to be dual to a Sachdev-Ye-Kitaev (SYK) model with random complex couplings. We find that the free energy of the half-wormhole is strikingly similar to that of a single realization of this SYK model. These results suggest that the gravitational path integral computes an average over spacetime D-brane boundary conditions.

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Antonio M. García-García, Victor Godet. 2022-04-14. Half-wormholes in nearly AdS$_2$ holography. https://doi.org/10.21468/scipostphys.12.4.135

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