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Creators/Authors contains: "Knop, Waltraut"

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  1. ; ; ; (, Journal of High Energy Physics)
    A<sc>bstract</sc> We study thermal two-point functions and four-point functions involving two heavy twisted operators and two light probes in symmetric product orbifolds. We identify cases where they are universal at largeN, that is, they are only sensitive to the orbifold structure. Surprisingly, such observables mimic correlators obtained from the BTZ background, even though symmetric product orbifolds are not dual to semi-classical gravity. We discuss the interpretation of these results in light of the criteria for emergence of spacetime via Von Neumann algebras. Our analysis implies that a condition on the infiniteNthermal two-point functions cannot be stringent enough to define an emergent spacetime and the concept of a sharp horizon. 
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    Free, publicly-accessible full text available May 1, 2026
  2. ; (, Journal of High Energy Physics)
    A bstract Dispersion relations for S-matrices and CFT correlators translate UV consistency into bounds on IR observables. In this note, we construct dispersive sum rules for 1D CFTs. We use them to prove bounds on higher-derivative couplings in weakly-coupled non-gravitational EFTs in AdS 2 . At the leading order in the bulk-point limit, the bounds agree with the flat-space result. We compute the leading universal effect of finite AdS radius on the bounds. Along the way, we give an explicit formula for anomalous dimensions in general higher-derivative contact Witten diagrams in AdS 2 . 
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