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Half-maximal gauged supergravity in seven dimensions coupled to $n$ vectormultiplets contains $n+3$ vectors and $3n+1$ scalars parametrized by$\mathbb{R}^+\times SO(3,n)/SO(3)\times SO(n)$ coset manifold. The two-formfield in the gravity multiplet can be dualized to a three-form field whichadmits a topological mass term. Possible non-compact gauge groups take the formof $G_0\times H\subset SO(3,n)$ with a compact group $H$. $G_0$ is one of thefive possibilities; $SO(3,1)$, $SL(3,\mathbb{R})$, $SO(2,2)$, $SO(2,1)$ and$SO(2,2)\times SO(2,1)$. We investigate all of these possible non-compact gaugegroups and classify their vacua. Unlike the gauged supergravity without atopological mass term, there are new supersymmetric $AdS_7$ vacua in the$SO(3,1)$ and $SL(3,\mathbb{R})$ gaugings. These correspond to new $N=(1,0)$superconformal field theories (SCFT) in six dimensions. Additionally, we find aclass of $AdS_5\times S^2$ and $AdS_5\times H^2$ backgrounds with $SO(2)$ and$SO(2)\times SO(2)$ symmetries. These should correspond to $N=1$ SCFTs in fourdimensions obtained from twisted compactifications of six-dimensional fieldtheories on $S^2$ or $H^2$. We also study RG flows from six-dimensional$N=(1,0)$ SCFT to $N=1$ SCFT in four dimensions and RG flows from afour-dimensional $N=1$ SCFT to a six-dimensional SYM in the IR. The former aredriven by a vacuum expectation value of a dimension-four operator dual to thesupergravity dilaton while the latter are driven by vacuum expectation valuesof marginal operators.

Noncompact gauging of N=2 7D supergravity and AdS/CFT holography