Dynamics of $E_6$ Chiral Gauge Theories

TL;DR

This paper provides exact non-perturbative solutions for $E_6$ chiral gauge theories with matter fermions, revealing novel universality classes and potential unbroken symmetries through numerical analysis.

Contribution

It introduces new non-perturbative solutions for $E_6$ chiral gauge theories, highlighting differences from tumbling hypothesis predictions and exploring unbroken symmetries.

Findings

Potential unbroken $ ext{SU}(3)$ symmetry with massless composite fermions.

Distinct universality classes from previous conjectures.

Numerical solutions for the ground state in specific cases.

Abstract

We present exact non-perturbative solutions to chiral gauge theories based on the $E_6$ gauge group and several matter fermions in the fundamental $\bf{27}$-dimensional representation. They are obtained when supersymmetric versions are perturbed by small supersymmetry breaking by anomaly mediation. The universality classes obtained are very different from what can be conjectured by the tumbling hypothesis. In particular, the case with three $\bf{27}$s may have an unbroken $\text{SU}(3)$ symmetry with massless composite fermions in $\bf{10}$ of $\text{SU}(3)$. For this case, we employed numerical techniques to obtain the exact ground state.