We study which bulk couplings contribute to the $S^3$ free energy $F(\mathfrak{ m})$ of three-dimensional ${ \cal N} = 2$ superconformal field theories with holographic duals, potentially deformed by boundary real-mass parameters $\mathfrak{ m}$. In particular, we show that $F(\mathfrak{ m})$ is independent of a large class of bulk couplings that include non-chiral F-terms and all D-terms. On the other hand, in general, $F(\mathfrak{ m})$ does depend non-trivially on bulk chiral F-terms, such as prepotential interactions, and on bulk real-mass terms. These conclusions can be reached solely from properties of the AdS super-algebra, $\mathfrak{ osp}(2|4)$. We also consider massive vector multiplets in AdS, which in the dual field theory correspond to long single-trace superconformal multiplets of spin zero. We provide evidence that $F(\mathfrak{ m})$ is insensitive to the vector multiplet mass and to the interaction couplings between the massive vector multiplet and massless ones. In particular, this implies that $F(\mathfrak{ m})$ does not contain information about scaling dimensions or OPE coefficients of single-trace long scalar ${ \cal N} = 2$ superconformal multiplets.
Categories: hep-th
