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arXiv 1607.03053hep-th
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背景场形式下的协变单场有效action

Covariant and single-field effective action with the background-field formalism

Mahmoud Safari, Gian Paolo Vacca

摘要:

在标量量子场论的背景下,我们引入了一类广义非线性量子背景分裂,对于这种分裂,可以精确地解出分裂沃德恒等式,它编码了有效作用量中的单场依赖性。我们表明,这可以用来构建一个有效的行动,这是既协变和依赖于背景和波动场,只有通过一个单一的总场的方式独立的动力学。此外,我们还讨论了量子有效作用量继承紫外对称性的判据。该方法通过一些例子,包括$O(N)$有效场论,这可能是感兴趣的希格斯扇区的标准模型或其扩展证明。

英文摘要:

In the context of scalar quantum field theory we introduce a class of generically nonlinear quantum-background splits for which the splitting Ward identity, encoding the single field dependence in the effective action, can be solved exactly. We show that this can be used to construct an effective action which is both covariant and dependent on the background and fluctuation fields only through a single total field in a way independent from the dynamics. Moreover we discuss the criteria under which the ultraviolet symmetries are inherited by the quantum effective action. The approach is demonstrated through some examples, including the $O(N)$ effective field theory, which might be of interest for the Higgs sector of the Standard Model or its extensions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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