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arXiv 2101.04090hep-th
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关于共形场论中对易关系的一个注记

A Note on Commutation Relation in Conformal Field Theory

Lento Nagano, Seiji Terashima

摘要:

本文计算了d维圆柱上共形场论中标量场交换子的真空期望值。我们发现,从明确的计算,我们需要涂抹不仅在空间上,而且在时间上有有限的标量算子,除了那些自由标量算子。因此,对于非自由共形场论,即使从拉格朗日量定义,标量场的等时子也不是很好定义的。我们也有一个共形场论的交换子闵可夫斯基空间,而不是圆柱,通过采取小距离限制。对于闵可夫斯基空间上的共形场论,上述陈述也适用。

英文摘要:

In this note, we explicitly compute the vacuum expectation value of the commutator of scalar fields in a d-dimensional conformal field theory on the cylinder. We find from explicit calculations that we need smearing not only in space but also in time to have finite commutators except for those of free scalar operators. Thus the equal time commutators of the scalar fields are not well-defined for a non-free conformal field theory, even if which is defined from the Lagrangian. We also have the commutator for a conformal field theory on Minkowski space, instead of the cylinder, by taking the small distance limit. For the conformal field theory on Minkowski space, the above statements are also applied.

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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