Marginal Deformations of 3d N=4 Linear Quiver Theories

Abstract

We study superconformal deformations of the $T_{\rho }^{\hat{\rho }}[SU(N)]$ theories of Gaiotto-Hanany-Witten, paying special attention to mixed-branch operators with both electrically- and magnetically-charged fields. We explain why all marginal $\mathcal{N}=2$ operators of an $\mathcal{N}=4$ CFT${}_3$ can be extracted unambiguously from the superconformal index. Computing the index at the appropriate order we show that the mixed moduli in $T_{\rho }^{\hat{\rho }}[SU(N)]$ theories are double-string operators transforming in the (Adjoint, Adjoint) representation of the electric and magnetic flavour groups, up to some overcounting for quivers with abelian gauge nodes. We comment on the holographic interpretation of the results, arguing in particular that gauged supergravities can capture the entire moduli space if, in addition to the (classical) parameters of the background solution, one takes also into account the (quantization) moduli of boundary conditions.

arXiv comment35 pages. v3: published version (more explicit formulas)

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