Emergent Supersymmetry at Large $N$

TL;DR

This paper investigates infrared fixed points in Gross-Neveu Yukawa models with matrix fields, revealing emergent supersymmetry at large N and potential holographic duals.

Contribution

It identifies supersymmetric and non-supersymmetric fixed points in matrix models and shows emergent supersymmetry at large N, with implications for holography.

Findings

Supersymmetric fixed points exist for all N in certain models.

A non-supersymmetric fixed point mimics supersymmetry at large N.

Planar diagrams dominate the large-N limit, hinting at string duals.

Abstract

We search for infrared fixed points of Gross-Neveu Yukawa models with matrix degrees of freedom in $d=4-\varepsilon$. We consider three models -- a model with $SU(N)$ symmetry in which the scalar and fermionic fields both transform in the adjoint representation, a model with $SO(N)$ symmetry in which the scalar and fermion fields both transform as real symmetric-traceless matrices, and a model with $SO(N)$ symmetry in which the scalar field transforms as a real symmetric-traceless matrix, while the fermion transforms in the adjoint representation. These models differ at finite $N$, but their large-$N$ limits are perturbatively equivalent. The first two models contain a supersymmetric fixed point for all $N$, which is attractive to all classically-marginal deformations for $N$ sufficiently large. The third model possesses a stable fixed point that, although non-supersymmetric, gives rise to many correlation functions that are identical to those of a supersymmetric fixed point when $N$ is sufficiently large. We also find several non-supersymmetric fixed points at finite and large-$N$. Planar diagrams dominate the large-$N$ limit of these fixed points, which suggests the possibility of a stringy holographic dual description.