Superconformal Blocks: General Theory

Abstract

In this work we launch a systematic theory of superconformal blocks for four-point functions of arbitrary supermultiplets. Our results apply to a large class of superconformal field theories including 4-dimensional models with any number $\mathcal{N}$ of supersymmetries. The central new ingredient is a universal construction of the relevant Casimir differential equations. In order to find these equations, we model superconformal blocks as functions on the supergroup and pick a distinguished set of coordinates. The latter are chosen so that the superconformal Casimir operator can be written as a perturbation of the Casimir operator for spinning bosonic blocks by a fermionic (nilpotent) term. Solutions to the associated eigenvalue problem can be obtained through a quantum mechanical perturbation theory that truncates at some finite order so that all results are exact. We illustrate the general theory at the example of $d=1$ dimensional theories with $\mathcal{N}=2$ supersymmetry for which we recover known superblocks. The paper concludes with an outlook to 4-dimensional blocks with $\mathcal{N}=1$ supersymmetry.

JHEP format, an appendix and remarks added, typos corrected

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• Superconformal Boundaries in $4-\epsilon$ dimensions
• Conformal Group Theory of Tensor Structures
• Bootstrapping Coulomb and Higgs branch operators
• Differential operators for superconformal correlation functions
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• Universal Spinning Casimir Equations and Their Solutions
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• Crossing Symmetry for Long Multiplets in 4D $\mathcal{N}=1$ SCFTs