All three-loop four-point correlators of half-BPS operators in planar N=4 SYM

TL;DR

This paper computes the four-point correlators of half-BPS operators in planar N=4 SYM up to three loops using symmetry and singularity properties, providing results that test integrability predictions.

Contribution

It introduces a novel method to determine three-loop four-point correlators in planar N=4 SYM based on integrand properties and light-cone OPE relations.

Findings

Explicit three-loop four-point correlator expressions

Validation of integrability predictions for OPE structure constants

Framework applicable to arbitrary operator weights

Abstract

We obtain the planar correlation function of four half-BPS operators of arbitrary weights, up to three loops. Our method exploits only elementary properties of the integrand of the planar correlator, such as its symmetries and singularity structure. This allows us to write down a general ansatz for the integrand. The coefficients in the ansatz are fixed by means of a powerful light-cone OPE relation between correlators with different weights. Our result is formulated in terms of a limited number of functions built from known one-, two- and three-loop conformal integrals. These results are useful for checking recent integrability predictions for the OPE structure constants.