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arXiv 1807.09296hep-th
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平坦时空中的消失迹anomaly

Vanishing trace anomaly in flat spacetime

Zygmunt Lalak, Paweł Olszewski

摘要:

量子尺度不变正则化是维正则化的一种变体,其中重整化尺度被视为动力学场。但是,与其说它是一种与维正则化、动量截断、Pauli-Villars等方法同等重要的新型正则化方法,它应该被理解为在某种类型的不可重正化模型的无限空间中定义子集的一种方式。子集实现的要求,重整化尺度,以及任何其他维度的参数,应被解释为一个动力场的均匀背景。这个限制是最直接的实现使用维正则化,但它可以假设是强加与任何正则化方法。满足它的理论提供了一个新的视角与RGE功能相关的全球尺度对称性的辐射破坏。由于实现了量子尺度不变正则化,尽管RGE函数是非零的,但在量子水平上保持了尺度对称性,这可以在控制格林函数膨胀的复合量子算符的水平上进行检查。我们使用一个特定的,但很容易概括的玩具模型与标量场明确的细节分析这些语句。

英文摘要:

Quantum scale invariant regularization is a variant of dimensional regularization where the renormalization scale is treated as a dynamical field. But, rather than be regarded as a novel regularization method on par with dimensional regularization, momentum cutoff, Pauli-Villars etc., it should be understood as a way to define a subset in the infinite space of nonrenormalizable models of certain type. The subset realizes the demand that renormalization scale, along with any other dimensionful parameters, should be interpreted as a dynamical field's homogeneous background. This restriction is most straightforwardly implemented using dimensional regularization but it can hypothetically be imposed with any regularization method. Theories that satisfy it offer a new perspective on the radiative violation of global scale symmetry associated with RGE functions. As a result of the quantum scale invariant regularization being implemented, the scale symmetry is preserved at the quantum level despite the RGE functions being non-zero, as can be inspected at the level of composite quantum operators that govern dilatation of Green functions. We analyze these statements in explicit detail using a specific but easily generalized toy model with scalar fields.

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