# Superconformal Blocks: General Theory

## TL;DR

This paper develops a universal, systematic framework for superconformal blocks applicable to a wide range of superconformal field theories, providing exact solutions via a perturbative approach to Casimir differential equations.

## Contribution

It introduces a universal construction of Casimir equations for superconformal blocks, modeling them as functions on the supergroup and solving via quantum mechanical perturbation theory.

## Key findings

- Recovered known superblocks in 1D with N=2 supersymmetry
- Established a perturbative method for solving superconformal Casimir equations
- Outlined an approach for 4D superconformal blocks with N=1 supersymmetry

## 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.