Double-Trace Deformations of Conformal Correlations

TL;DR

This paper analyzes how double-trace deformations affect scalar four-point functions in large N conformal field theories, providing insights into operator dimensions and three-point coefficients through holographic duality.

Contribution

It computes the leading order change in four-point functions under double-trace flow and interprets these changes via boundary conditions in AdS, offering new understanding of operator data evolution.

Findings

Change in conformal dimensions of double-trace operators

Sign-definiteness of certain operator quantities under flow

Derived anomalous dimensions in the O(N) vector model

Abstract

Large $N$ conformal field theories often admit unitary renormalization group flows triggered by double-trace deformations. We compute the change in scalar four-point functions under double-trace flow, to leading order in $1/N$. This has a simple dual in AdS, where the flow is implemented by a change of boundary conditions, and provides a physical interpretation of single-valued conformal partial waves. We extract the change in the conformal dimensions and three-point coefficients of infinite families of double-trace composite operators. Some of these quantities are found to be sign-definite under double-trace flow. As an application, we derive anomalous dimensions of spinning double-trace operators comprised of non-singlet constituents in the $O(N)$ vector model.