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arXiv 2104.01220hep-th
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自由场论中的单值缺陷

Monodromy Defects in Free Field Theories

Lorenzo Bianchi, Adam Chalabi, Vladimír Procházka, Brandon Robinson, Jacopo Sisti

摘要:

本文研究了任意$d$维共形耦合标量和自由狄拉克费米子理论中的余维二单值缺陷。我们通过计算阿贝尔味对称的应力张量和守恒电流的单点函数以及位移算子的两点函数来计算这个共形缺陷家族。在$d=4$的情况下,这些关联函数的归一化与缺陷外尔异常系数有关,从而提供关于缺陷共形场论的关键信息。通过计算缺陷对纠缠熵贡献的普适部分,我们对缺陷中心荷的值进行了明确的检查,并进一步利用我们的结果提取了真空Rényi熵的普适部分.此外,我们利用非超对称自由场的结果来计算一个新的缺陷Weyl异常系数的$d=4$理论的自由$\mathcal{N}=2$超多重态。包括奇异模式中的缺陷算子乘积展开的基本领域,我们确定显着的相关变形的奇异缺陷理论,并表明它们触发一个重正化组流的IR固定点与最经常的缺陷OPE。我们还研究了自由$d=4$ Maxwell理论中的Gukov-Witten缺陷,并证明了它们的中心荷消失。

英文摘要:

We study co-dimension two monodromy defects in theories of conformally coupled scalars and free Dirac fermions in arbitrary $d$ dimensions. We characterise this family of conformal defects by computing the one-point functions of the stress-tensor and conserved current for Abelian flavour symmetries as well as two-point functions of the displacement operator. In the case of $d=4$, the normalisation of these correlation functions are related to defect Weyl anomaly coefficients, and thus provide crucial information about the defect conformal field theory. We provide explicit checks on the values of the defect central charges by calculating the universal part of the defect contribution to entanglement entropy, and further, we use our results to extract the universal part of the vacuum Rényi entropy. Moreover, we leverage the non-supersymmetric free field results to compute a novel defect Weyl anomaly coefficient in a $d=4$ theory of free $\mathcal{N}=2$ hypermultiplets. Including singular modes in the defect operator product expansion of fundamental fields, we identify notable relevant deformations in the singular defect theories and show that they trigger a renormalisation group flow towards an IR fixed point with the most regular defect OPE. We also study Gukov-Witten defects in free $d=4$ Maxwell theory and show that their central charges vanish.

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