Spectrum of anomalous dimensions in hypercubic theories

TL;DR

This paper calculates the one-loop anomalous dimensions of composite operators in the $O(N)$ vector model with cubic anisotropy, revealing structural patterns and providing explicit solutions for operators with up to six fields.

Contribution

It provides a complete closed-form expression for non-mixing operator anomalous dimensions and outlines the general mixing structure in hypercubic theories.

Findings

Explicit solutions for operators with up to 6 fields.

Identification of structural patterns in the spectrum.

Sample OPE coefficients calculated.

Abstract

We compute the spectrum of anomalous dimensions of non-derivative composite operators with an arbitrary number of fields $n$ in the $O(N)$ vector model with cubic anisotropy at the one-loop order in the $\epsilon$-expansion. The complete closed-form expression for the anomalous dimensions of the operators which do not undergo mixing effects is derived and the structure of the general solution to the mixing problem is outlined. As examples, the full explicit solution for operators with up to $n=6$ fields is presented and a sample of the OPE coefficients is calculated. The main features of the spectrum are described, including an interesting pattern pointing to the deeper structure.