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arXiv 2407.07856hep-th
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来自双迹形变的 RG 界面

RG Interfaces from Double-Trace Deformations

Simone Giombi, Elizabeth Helfenberger, Himanshu Khanchandani

AI总结:

本文通过在半空间开启双迹形变构造界面共形场论,利用大 N 展开计算缺陷共形场论数据和自由能,并验证其与 AdS 引力全息对偶预言精确一致。

摘要:

我们研究一类界面共形场论,其构造方式为取一个大 N 共形场论并在半空间上开启一个相关的双迹形变。在低能下,这会产生一个共形界面,将两个通过重整化群流联系起来的共形场论分隔开。我们通过在半空间上使用 Hubbard-Stratonovich 变换来建立这些模型的大 N 展开,并利用这一方法计算部分缺陷共形场论数据。我们还计算了球面界面情形下理论的自由能,其中编码了偶数维界面的共形反常系数,以及奇数维界面的 g 函数类比量。这些模型在 AdS 中的引力理论方面具有对偶描述,其中一个体标量场在 AdS 边界的每一半上满足不同的边界条件。我们回顾了这一构造,并证明共形场论侧的大 N 展开结果与全息预言精确一致。

英文摘要:

We study a class of interface conformal field theories obtained by taking a large $N$ CFT and turning on a relevant double-trace deformation over half space. At low energies, this leads to a conformal interface separating two CFTs which are related by RG flow. We set up the large $N$ expansion of these models by employing a Hubbard-Stratonovich transformation over half space, and use this approach to compute some of the defect CFT data. We also calculate the free energy of the theory in the case of spherical interface, which encodes a conformal anomaly coefficient for even dimensional interface, and the analog of the $g$-function for odd-dimensional interface. These models have a dual description in terms of a gravitational theory in AdS where a bulk scalar field satisfies different boundary conditions on each half of the AdS boundary. We review this construction and show that the results of the large $N$ expansion on the CFT side are in precise agreement with the holographic predictions.

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