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arXiv 1904.04852hep-th
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超共形块:一般理论

Superconformal Blocks: General Theory

Ilija Buric, Volker Schomerus, Evgeny Sobko

摘要:

在这项工作中,我们推出了一个系统的理论超共形块的四点函数的任意超多重态。我们的结果适用于一个大类的超共形场理论,包括4维模型与任何数量的超对称性$\mathcal{N}$。新的中心要素是相关的卡西米尔微分方程的普遍构造。为了找到这些方程,我们将超共形块建模为超群上的函数,并选择一组独特的坐标。后者的选择,使超共形的卡西米尔运营商可以被写入作为一个微扰的卡西米尔运营商自旋玻色子块的费米子(幂零)项。相关本征值问题的解可以通过量子力学微扰理论得到,该理论在某个有限阶截断,使得所有结果都是精确的。我们说明的$d=1$维理论与$\mathcal{N}=2$超对称性的例子,我们恢复已知的超级块的一般理论。最后对具有$\mathcal{N}=1$超对称性的四维块体进行了展望。

英文摘要:

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.

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