Triviality of Quantum Electrodynamics Revisited
Triviality of Quantum Electrodynamics Revisited
复制标题
重新审视量子电动力学的琐碎性
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
U. Meissner
中科院分区：
文献类型：
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作者：
D. Djukanovic;J. Gegelia;U. Meissner
量子电动力学通常被认为是一个微不足道的理论。这是基于一些数字和分析证据。QED的平凡性的一个强有力的迹象是运行耦合的朗道极的存在。我们表明，通过处理QED作为有效场论的首阶近似，并包括次首阶修正，朗道极点被删除。我们还分析了截止依赖的裸耦合在两个循环的顺序，并得出结论的猜想，即自洽的原因，QED需要是平凡的是一个纯粹的人工制品的领导阶近似相应的有效场论。
Quantum electrodynamics is often considered to be a trivial theory. This is based on a number of evidences, both numerical and analytical. One of the strong indications for triviality of QED is the existence of the Landau pole for the running coupling. We show that by treating QED as the leading order approximation of an effective field theory and including the next-to-leading order corrections, the Landau pole is removed. We also analyze the cutoff dependence of the bare coupling at two-loop order and conclude that the conjecture, that for reasons of self-consistency, QED needs to be trivial is a mere artefact of the leading order approximation to the corresponding effective field theory.