Renormalization group flow of $O(N)^3$-invariant general sextic tensor model

TL;DR

This paper calculates the renormalization group flow of a complex sextic tensor model with $O(N)^3$ symmetry, identifying fixed points and showing that additional interactions do not alter the long-range fixed point structure.

Contribution

It provides explicit beta function computations for the $O(N)^3$-invariant sextic tensor model at leading order in $1/N$, revealing fixed point structures and their relation to $U(N)^3$ models.

Findings

Three fixed points in the short-range case.

A line of fixed points in the long-range case.

Additional $O(N)^3$ interactions do not change the long-range fixed point structure.

Abstract

We compute the beta functions for the $O(N)^3$-invariant general sextic tensor model up to cubic order in the coupling constant, and at leading order in the $1/N$ expansion. Our method is a direct, explicit one, in the sense that we identify the appropriate Feynman graphs, we compute their amplitudes which then allows us to obtain the $\beta$ functions of the model. We perform these computation considering both a long-range and a short-range propagator, within the dimensional regularization framework. We find three fixed points in the short-range case and a line of fixed points, parameterized by the wheel interaction, in the long-range case. This line of fixed points is identical to the one found in the case of the $U(N)^3$-invariant model. Our result proves that the additional $O(N)^3$-invariant interactions do not modify the long-range fixed point structure of the model.