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arXiv 0801.2462hep-thhep-ph
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无质量QED的可归和β函数

A Resummable beta-Function for Massless QED

Oliver J. Rosten

摘要:

在由广义的、明显规范不变的QED精确重整化群定义的一组方案中,我们认为四维无质量理论中的β函数不可能具有任何非微扰的幂次修正。因此,β函数的微扰表达式必须是可微扰的。这个论点不能扩展到其他耦合的流动或费米子的反常维度,因此微扰理论在高斯不动点的临界表面上没有定义唯一的轨迹。因此,beta函数的可扩展性与不存在非平凡不动点的期望并不矛盾。

英文摘要:

Within the set of schemes defined by generalized, manifestly gauge invariant exact renormalization groups for QED, it is argued that the beta-function in the four dimensional massless theory cannot possess any nonperturbative power corrections. Consequently, the perturbative expression for the beta-function must be resummable. This argument cannot be extended to flows of the other couplings or to the anomalous dimension of the fermions and so perturbation theory does not define a unique trajectory in the critical surface of the Gaussian fixed point. Thus, resummability of the beta-function is not inconsistent with the expectation that a non-trivial fixed point does not exist.

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