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arXiv 0809.1338hep-th
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经典共形理论中的重整化群与有效势

Renormalization Group and Effective Potential in Classically Conformal Theories

Krzysztof A. Meissner, Hermann Nicolai

摘要:

我们推导出一个一般公式的RG改进的有效(科尔曼-温伯格)潜在的经典共形模型,将其应用到几个例子的物理利益,特别是一个模型的QCD耦合通过夸克的无色标量场。封闭形式的表达式,使我们能够讨论的有效潜力的有效性的范围,以及在一种不同于以往的这种分析的方式的问题的“大规模"。值得注意的是,在所有考虑的例子中,通过RG改进恢复了有效势的凸性,否则势变得不稳定。在前一种情况下,对称性破缺变得不可避免,因为红外势垒$Λ_{IR}$的出现,这暗示了$Λ_{QCD}$和电弱对称性破缺尺度之间迄今为止未被怀疑的联系。

英文摘要:

We derive a general formula for the RG improved effective (Coleman-Weinberg) potential for classically conformal models, applying it to several examples of physical interest, and in particular a model of QCD coupled via quarks to a colorless scalar field. The closed form expressions allow us to discuss the range of validity of the effective potential as well as the issue of `large logarithms' in a way different from previous such analyses. Remarkably, in all examples considered, convexity of the effective potential is restored by the RG improvement, or otherwise the potential becomes unstable. In the former case, symmetry breaking becomes unavoidable due to the appearance of an infrared barrier $Λ_{IR}$, which hints at a so far unsuspected link between $Λ_{QCD}$ and the scale of electroweak symmetry breaking.

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