From 3d duality to 2d duality

Abstract

In this paper we discuss $3d$ $\mathcal{N}=2$ supersymmetric gauge theories and their IR dualities when they are compactified on a circle of radius $r$, and when we take the $2d$ limit in which $r\to 0$. The $2d$ limit depends on how the mass parameters are scaled as $r\to 0$, and often vacua become infinitely distant in the $2d$ limit, leading to a direct sum of different $2d$ theories. For generic mass parameters, when we take the same limit on both sides of a duality, we obtain $2d$ dualities (between gauge theories and/or Landau-Ginzburg theories) that pass all the usual tests. However, when there are non-compact branches the discussion is subtle because the metric on the moduli space, which is not controlled by supersymmetry, plays an important role in the low-energy dynamics after compactification. Generally speaking, for IR dualities of gauge theories, we conjecture that dualities involving non-compact Higgs branches survive. On the other hand when there is a non-compact Coulomb branch on at least one side of the duality, the duality fails already when the $3d$ theories are compactified on a circle. Using the valid reductions we reproduce many known $2d$ IR dualities, giving further evidence for their validity, and we also find new $2d$ dualities.

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• New 2d $\mathcal{N}=(0,2)$ dualities from four dimensions
• Mirror theories of 3d $\mathcal{N}=2$ SQCD
• $3d$ Printing of $2d$ $\mathcal{N}=(0,2)$ Gauge Theories
• Mirror Symmetry and Bosonization in 2d and 3d
• The $SL(2,\mathbb{Z})$ dualization algorithm at work
• On 3d Seiberg-like Dualities with Two Adjoints
• Holonomy Saddles and Supersymmetry
• Star shaped quivers with flux
• Integrable lattice spin models from supersymmetric dualities
• Categorical Equivalence and the Renormalization Group
• Notes on 8 Majorana Fermions
• Aspects of 5d Seiberg-Witten Theories on ${\mathbb{S}}^1$
• Supersymmetric gauged matrix models from dimensional reduction on a sphere
• Singular BPS boundary conditions in $\mathcal{N}=(2,2)$ supersymmetric gauge theories
• Decomposition squared
• Intersecting Surface defects and 3d Superconformal indices
• A survey of recent developments in GLSMs
• Aspects of 4d supersymmetric dynamics and geometry