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- Title
Freedom near lightcone and ANEC saturation.
- Authors
Huang, Kuo-Wei; Karlsson, Robin; Parnachev, Andrei; Valach, Samuel
- Abstract
Averaged Null Energy Conditions (ANECs) hold in unitary quantum field theories. In conformal field theories, ANECs in states created by the application of the stress tensor to the vacuum lead to three constraints on the stress-tensor three-point couplings, depending on the choice of polarization. The same constraints follow from considering two-point functions of the stress tensor in a thermal state and focusing on the contribution of the stress tensor in the operator product expansion (OPE). One can observe this in holographic Gauss-Bonnet gravity, where ANEC saturation coincides with the appearance of superluminal signal propagation in thermal states. We show that, when this happens, the corresponding generalizations of ANECs for higher-spin multi-stress tensor operators with minimal twist are saturated as well and all contributions from such operators to the thermal two-point functions vanish in the lightcone limit. This leads to a special near-lightcone behavior of the thermal stress-tensor correlators — they take the vacuum form, independent of temperature.
- Subjects
OPERATOR product expansions; QUANTUM field theory; STRAINS &; stresses (Mechanics); EINSTEIN-Gauss-Bonnet gravity; TENSOR products; CONFORMAL field theory; VACUUM; SUPERRADIANCE
- Publication
Journal of High Energy Physics, 2023, Vol 2023, Issue 5, p1
- ISSN
1126-6708
- Publication type
Article
- DOI
10.1007/JHEP05(2023)065