Kavli Affiliate: Yuji Tachikawa
| Summary:
We study aspects of the AdS/CFT correspondence for $mathcalN=4$ $U(N)$ super Yang-Mills theory on $S^3/Γ$, where $Γsubset SU(2)$ is a finite subgroup, leading to an ADE singularity in the bulk AdS geometry. We show that a large vacuum degeneracy arises from the choice of gauge holonomy on $S^3/Γ$. On the gravity side, we argue that the bulk ADE singularity supports topological degrees of freedom responsible for this degeneracy. We then provide a holographic derivation of a corresponding large vacuum degeneracy for class S theories of type $U(N)$, showing that these topological degrees of freedom admit an effective description in terms of a three-dimensional level-$N$ Chern-Simons theory, whose gauge group $mathsfG$ is determined by $Γ$. Finally, we discuss how the one-form symmetries of the $mathcalN=4$ super Yang-Mills theory are realized on the Chern-Simons theory side.
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