Universal Asymptotics for High Energy CFT Data

Abstract

Equilibrium finite temperature observables of a CFT can be described by a local effective action for background fields -- a "thermal effective action." This effective action determines the asymptotic density of states of a CFT as a detailed function of dimension and spin. We discuss subleading perturbative and nonperturbative corrections to the density, comparing with free and holographic examples. We furthermore show how to use the thermal effective action on more complicated geometries at special locations called "hot spots." The hot spot idea makes a prediction for a CFT partition function on a higher-dimensional version of a genus-2 Riemann surface, in a particular high temperature limit. By decomposing the partition function into a novel higher-dimensional version of genus-2 conformal blocks (which we compute at large scaling dimension), we extract the asymptotic density of heavy-heavy-heavy OPE coefficients in a higher-dimensional CFT. We also compute asymptotics of thermal 1-point functions using the same techniques.

73 pages plus appendices, v2: references added, v3: minor typos corrected, v4: published version, v5: minor typos corrected

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• Flat space gravity at finite cutoff
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• Moments and saddles of heavy CFT correlators
• Supersymmetric zeta functions and determinants
• A Reverse Black Hole Information Problem