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arXiv 2101.07615hep-th
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局部Wilson截断下的Weyl相合条件

Weyl Consistency Conditions from a local Wilsonian Cutoff

Ulrich Ellwanger

摘要:

局部UV截止$Λ(x)$变换下的外尔重标度允许构造外尔不变的动力学项的标量场包括威尔逊截止函数。首先,我们考虑弯曲时空中的标量场,具有任意正则维数的局部裸耦合,以及描述它们依赖于UV截止的反常维数。UV截止的局部分量起着额外耦合的作用,尽管具有平凡的常数$β$函数。这种方法允许导出Weyl一致性条件相应的异常尺寸假设的形式的一个确切的梯度流。对于可重正化理论的Weyl一致性条件最初的形式的近似梯度流的$β$功能,我们推导出的条件下,它成为一个确切的梯度流的形式。

英文摘要:

A local UV cutoff $Λ(x)$ transforming under Weyl rescalings allows to construct Weyl invariant kinetic terms for scalar fields including Wilsonian cutoff functions. First we consider scalar fields in curved space-time with local bare couplings of any canonical dimension, and anomalous dimensions which describe their dependence on the UV cutoff. The local component of the UV cutoff plays the role of an additional coupling, albeit with a trivial constant $β$ function. This approach allows to derive Weyl consistency conditions for the corresponding anomalous dimensions which assume the form of an exact gradient flow. For renormalizable theories the Weyl consistency conditions are initially of the form of an approximate gradient flow for the $β$ functions, and we derive conditions under which it becomes the form of an exact gradient flow.

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