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arXiv 2205.09765hep-th
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缺陷CFT的色散关系

A dispersion relation for defect CFT

Julien Barrat, Aleix Gimenez-Grau, Pedro Liendo

摘要:

我们提出了一个缺陷CFT的色散关系,重建两点功能的缺陷作为一个单一的不连续性的积分的存在。这个公式的主要优点是它简化了显式的自助计算,绕过了共形块的重新计算。作为应用,我们再现已知的结果单值缺陷的ε展开,并提出了新的结果在强耦合的超对称威尔逊线在$\mathcal{N}=4$ SYM。特别地,我们导出了任意长度的单迹算子的最高$R$ -对称通道的一个新的解析公式。

英文摘要:

We present a dispersion relation for defect CFT that reconstructs two-point functions in the presence of a defect as an integral of a single discontinuity. The main virtue of this formula is that it streamlines explicit bootstrap calculations, bypassing the resummation of conformal blocks. As applications we reproduce known results for monodromy defects in the epsilon-expansion, and present new results for the supersymmetric Wilson line at strong coupling in $\mathcal{N}=4$ SYM. In particular, we derive a new analytic formula for the highest $R$-symmetry channel of single-trace operators of arbitrary length.

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