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arXiv 2512.23976hep-thcond-mat.str-el
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关于对称简单共形边界条件的不存在性

On the Absence of Symmetric Simple Conformal Boundary Conditions

Nanjing University(南京大学);University of Chinese Academy of Sciences(中国科学院大学)

Pengcheng Wei, Yunqin Zheng

AI总结:

本研究揭示了在存在非平凡't Hooft异常的CFT中,简单对称共形边界条件不存在的根本原因,并提出了一种判断该现象的准则。

摘要:

非平凡的't Hooft异常阻碍了在共形场论中存在简单对称共形边界条件。相反,有一种普遍的观念认为,平凡的't Hooft异常保证了在给定的共形场论中存在简单对称共形边界条件。最近,在四重临界伊辛CFT [1] 和紧致玻色子 [2] 中发现了这种观念的反例——在这些CFT中,保持某些无异常子对称性的简单共形边界条件不存在。在本工作中,我们揭示了这些反例中这些边界条件不存在的根本原因,并提出了一种诊断任何给定二维CFT中该观念失效的准则。对称TFT描述在边界条件中起着关键作用。

英文摘要:

Non-trivial 't Hooft anomaly obstructs the existence of a simple symmetric conformal boundary condition in a CFT. Conversely, there is a common piece of lore that trivial 't Hooft anomaly promises the existence of a simple symmetry conformal boundary condition in a given CFT. Recently, counter examples to this lore was realized in tetracritical Ising CFT [1] and compact boson [2] -- the simple conformal boundary conditions preserving certain anomaly-free subsymmetry are absent in these CFTs. In this work, we uncover the underlying reason for the absence of these boundary conditions in counter examples, and propose a criterion diagnosing when the lore fails for any given 2d CFT. The Symmetry TFT description for boundary conditions plays a crucial role.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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