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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2106.00693hep-th
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异常、扩张和轨道褶皱

Anomalies, Extensions and Orbifolds

Daniel Robbins, Eric Sharpe, Thomas Vandermeulen

摘要:

我们在轨道共形场论的背景下研究规范反常。这种异常表现为轨道配分函数的成分中模不变性的失败。我们回顾这种不规则性是如何分类的上同调和如何扩展的orbifold群可以删除it.Working与这样的扩展需要一个一致的方式,其中扩展组可以作用于扭曲的原始对称状态的理解,这导致我们到一个离散的扭曲一样的选择,存在于orbifold平凡的作用子群。我们回顾了一个一般的方法来构建这样的扩展,并探讨其应用orbifolds。通过许多明确的例子,我们测试的猜想,一致的扩展应相当于(一般多个副本)orbifolds的非异常子群。

英文摘要:

We investigate gauge anomalies in the context of orbifold conformal field theories. Such anomalies manifest as failures of modular invariance in the constituents of the orbifold partition function. We review how this irregularity is classified by cohomology and how extending the orbifold group can remove it. Working with such extensions requires an understanding of the consistent ways in which extending groups can act on the twisted states of the original symmetry, which leads us to a discrete-torsion like choice that exists in orbifolds with trivially-acting subgroups. We review a general method for constructing such extensions and investigate its application to orbifolds. Through numerous explicit examples we test the conjecture that consistent extensions should be equivalent to (in general multiple copies of) orbifolds by non-anomalous subgroups.

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