Correlation Functions in $ω$-Deformed N=6 Supergravity

Abstract

Gauged N=8 supergravity in four dimensions is now known to admit a deformation characterized by a real parameter $ω$ lying in the interval $0\leω\le π/8$. We analyse the fluctuations about its anti-de Sitter vacuum, and show that the full N=8 supersymmetry can be maintained by the boundary conditions only for $ω=0$. For non-vanishing $ω$, and requiring that there be no propagating spin s>1 fields on the boundary, we show that N=3 is the maximum degree of supersymmetry that can be preserved by the boundary conditions. We then construct in detail the consistent truncation of the N=8 theory to give $ω$-deformed SO(6) gauged N=6 supergravity, again with $ω$ in the range $0\leω\le π/8$. We show that this theory admits fully N=6 supersymmetry-preserving boundary conditions not only for $ω=0$, but also for $ω=π/8$. These two theories are related by a U(1) electric-magnetic duality. We observe that the only three-point functions that depend on $ω$ involve the coupling of an SO(6) gauge field with the U(1) gauge field and a scalar or pseudo-scalar field. We compute these correlation functions and compare them with those of the undeformed N=6 theory. We find that the correlation functions in the $ω=π/8$ theory holographically correspond to amplitudes in the U(N)_k x U(N)_{-k} ABJM model in which the U(1) Noether current is replaced by a dynamical U(1) gauge field. We also show that the $ω$-deformed N=6 gauged supergravities can be obtained via consistent reductions from the eleven-dimensional or ten-dimensional type IIA supergravities.

38 pages, one figure