NLO in the large charge sector of the critical $O(N)$ model at large $N$

TL;DR

This paper calculates the next-to-leading order correction to the scaling dimensions of large-charge operators in the 3D critical O(N) model at large N, providing the most precise results for weakly-coupled conformal field theories.

Contribution

It introduces a double scaling limit approach to compute corrections in the large-charge sector of the critical O(N) model, linking to EFT predictions.

Findings

Results match conformal superfluid EFT predictions for Q >> N.

Provides next-to-leading order corrections to EFT Wilsonian coefficients.

Achieves the most precise determination of large-charge operator dimensions in weakly-coupled CFTs.

Abstract

We compute the next-to-leading correction to the scaling dimension of large-charge operators in the $3d$ critical $O(N)$ model in a double scaling limit in which both $N$ and the operator charge $Q$ are taken to be large. When $Q \gg N$ our result matches predictions from the conformal superfluid EFT and allows to extract next-to-leading order corrections to the EFT Wilsonian coefficients. At present, our result represents the most precise determination of large-charge operator scaling dimension in weakly-coupled CFTs.