Lightcone Commutator and Stress-Tensor Exchange in $d>2$ CFTs

Abstract

Motivated by developing a field-theoretic algebraic approach to the universal part of the stress-tensor sector of a scalar four-point function in a class of higher-dimensional CFTs, we construct a mode operator, ${\mathcal{L}}_m$, near the lightcone in $d=4$ CFTs and show that it leads to a Virasoro-like commutator, including a regularized central-term. As an example, we describe how to reproduce the $d=4$ single-stress tensor exchange contribution in the lightcone limit by a mode summation. A general-$d$ extension is included. We comment on possible generalizations.

13 pp; v2: various improvements, general-d stress-tensor exchange added. v3: minor corrections, published version

References in corpus (4)

• Entanglement Entropy at Large Central Charge
• Holographic Entanglement Entropy from 2d CFT: Heavy States and Local Quenches
• 4D Scattering Amplitudes and Asymptotic Symmetries from 2D CFT
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