# Diagrammatics of the quartic $O(N)^3$-invariant Sachdev-Ye-Kitaev-like tensor model

## TL;DR

This paper analyzes the diagrammatic structure of two SYK-like tensor models, revealing their graph relations and providing tools to classify graphs in the $1/N$ expansion, advancing understanding of their large-N behavior.

## Contribution

It introduces a diagrammatic toolbox for analyzing $O(N)^3$-invariant tensor models and relates their graphs to those of the MO model, enabling systematic classification.

## Key findings

- Feynman graphs of MO model are a subset of $O(N)^3$-invariant graphs with orientable jackets.
- Developed a method to identify all graphs at specific orders in the $1/N$ expansion.
- Applied the method to classify graphs at orders 1 and 3/2 in the large-N limit.

## Abstract

Various tensor models have been recently shown to have the same properties as the celebrated Sachdev-Ye-Kitaev (SYK) model. In this paper we study in detail the diagrammatics of two such SYK-like tensor models: the multi-orientable (MO) model which has an $U(N) \times O(N) \times U(N)$ symmetry and a quartic $O(N)^3$-invariant model whose interaction has the tetrahedral pattern. We show that the Feynman graphs of the MO model can be seen as the Feynman graphs of the $O(N)^3$-invariant model which have an orientable jacket. We then present a diagrammatic toolbox to analyze the $O(N)^3$-invariant graphs. This toolbox allows for a simple strategy to identify all the graphs of a given order in the $1/N$ expansion. We apply it to the next-to-next-to-leading and next-to-next-to-next-to-leading orders which are the graphs of degree $1$ and $3/2$ respectively.