Symmetric Product Orbifold Universality and the Mirage of an Emergent Spacetime

Abstract

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 large $N$, 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 infinite $N$ thermal two-point functions cannot be stringent enough to define an emergent spacetime and the concept of a sharp horizon.

51 pages, v2: minor changes, v3: minor changes, as published in JHEP

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• A New Supersymmetry Index for the D1-D5 CFT
• The Resolved Elliptic Genus and the D1-D5 CFT
• Searching for emergent spacetime in spin glasses
• The on-shell action of supergravity & the B-side of TsT and single-trace $T\bar{T}$