One-loop fixed points of adjoint multi-scalar gauge theory in four dimensions

TL;DR

This paper analyzes one-loop beta functions in four-dimensional $SU(N)$ gauge theories with multiple adjoint scalars, revealing a special fixed point at $M=22$ that may have implications for non-supersymmetric AdS/CFT correspondence.

Contribution

It provides a complete one-loop analysis of multi-scalar couplings in $SU(N)$ gauge theories, identifying a unique fixed point at $M=22$ with potential holographic significance.

Findings

Fixed point at $M=22$ where the gauge beta function vanishes.

Asymptotic freedom for $M<22$, non-trivial fixed points at $M=22$.

Number of fixed flows drops from eight to four between $M=22$ and $M=21$.

Abstract

We determine complete one-loop beta functions of the multi-scalar four-point couplings in four-dimensional $SU(N)$ gauge theories with $M$ adjoint scalar multiplets. For adjoints scalars, the sign of the one loop gauge coupling beta function depends solely on $M$, vanishing and changing sign precisely at $M=22$. For the multi-scalar potential at fixed gauge coupling we find several fixed points with different stability properties at large $N$. The analysis crucially involves the full set of four $SU(N)$ and $O(M)$ invariant single trace and double trace couplings. Taking the gauge coupling into account, there are asymptotically free RG flows for $M<22$ and non-trivial fixed points for $M=22$ at one loop, while $M>22$ appears to ruin the UV properties of the theory. Surprisingly, uniquely between $M=22$ and $M=21$ the number of fixed flows drops from eight to four in the large $N$ limit. There seems to be something very special about $M=22$. More speculatively, the $M=22$ one-loop conformal fixed point theory with $M$ adjoint scalars in $d=4$ suggests the possibility of an isolated non-supersymmetric, purely bosonic AdS$_{4+1} \times$S$^{22-1}$/CFT$_4$ correspondence. Our example suggests that extending the potential to the complete set of terms allowed by symmetries may lead to real fixed points also in non-supersymmetric theories descending from $\mathcal{N}=4$ super-Yang-Mills theory.