On $\mathcal{N}=4$ supersymmetry enhancements in three dimensions

Abstract

We introduce a class of 3d theories consisting of strongly-coupled $\mathcal{N}=4$ systems coupled to $\mathcal{N}=3$ Chern-Simons gauge multiplets, which exhibit $\mathcal{N}=4$ enhancements when a peculiar condition on the Chern-Simons levels is met. An example is the $SU(N{)}^3$ Chern-Simons theory coupled to the 3d $T_N$ theory, which enhances to $\mathcal{N}=4$ when $1/k_1+1/k_2+1/k_3=0$. We also show that some but not all of these $\mathcal{N}=4$ enhancements can be understood by considering M5-branes on a special class of Seifert manifolds. Our construction provides a large class of $\mathcal{N}=4$ theories which have not been studied previously.

arXiv comment28 pages + appendices. v2: An argument is provided showing that the condition for enhanced supersymmetry can be met for graph manifolds with generic holonomy

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• SymTFTs and Duality Defects from 6d SCFTs on 4-manifolds
• Generalized Symmetries and Anomalies of 3d N=4 SCFTs
• The $SL(2,\mathbb{Z})$ dualization algorithm at work
• Asymptotic degeneracies of M2-brane SCFTs
• Non-hyperbolic 3-manifolds and 3D field theories for 2D Virasoro minimal models
• Vacua, Symmetries, and Higgsing of Chern-Simons Matter Theories