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arxiv: hep-th/0112264 · v3 · submitted 2001-12-31 · ✦ hep-th

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"Double-trace" Deformations, Boundary Conditions and Spacetime Singularities

Micha Berkooz , Amit Sever , Assaf Shomer
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classification ✦ hep-th
keywords boundarynon-localworldsheetdeformationsdouble-traceactionsappearsapproximation
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Double-trace deformations of the AdS/CFT duality result in a new perturbation expansion for string theory, based on a non-local worldsheet. We discuss some aspects of the deformation in the low energy gravity approximation, where it appears as a change in the boundary condition of fields. We relate unique features of the boundary of AdS to the worldsheet becoming non-local, and conjecture that non-local worldsheet actions may be generic in other classes of backgrounds.

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  1. When AdS$_3$ Grows Hair: Boson Stars, Black Holes, and Double-Trace Deformations

    hep-th 2026-05 unverdicted novelty 7.0

    In AdS3 gravity with double-trace scalar boundary conditions, zero-frequency boson stars are the true ground state below the instability threshold, and hairy black holes carry higher entropy than BTZ at fixed mass and...