arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0904.3483hep-thhep-ph
收藏

利用Schwinger-Dyson方程的乘法重正化构造QED的全费米子光子顶点

Building the Full Fermion-Photon Vertex of QED by Imposing Multiplicative Renormalizability of the Schwinger-Dyson Equations for the Fermion and Photon Propagators

A. Kizilersu, M. R. Pennington

备注：
57 pages, 3 figures
发表信息：
Phys.Rev.D79:125020,2009
阅读 PDF
arXiv 页面 ↗HTML 原文 ↗

摘要：

原则上，在任何场论中计算一个完整的格林函数都需要知道无穷多点格林函数的集合，除非能找到某种方法截断相应的Schwinger-Dyson方程。对于量子电动力学中的费米子和玻色子传播子，这需要一个{ \it anomaly}作为完整的三点顶点。在这里，我们说明了如何规范不变性，规范协方差和乘法重整化的属性施加严格的限制，这种费米子玻色子相互作用，允许一致截断的传播方程。我们演示了如何这些条件意味着3点顶点{ \bf在传播方程}在很大程度上是由费米子传播本身的行为，而不是由知识的许多更高的点函数。我们给出了费米子-光子顶点的一种显式形式，它在费米子和光子传播子中满足无质量QED的所有导模的约束，并且符合微扰理论中在${\cal O}(α)$的弱耦合极限.这提供了第一次尝试推导非微扰费曼规则的强物理计算的传播子在无质量QED，确保一个更一致的截断的2点Schwinger-Dyson方程。对次领先阶和质量的推广将在较长的出版物中描述。

英文摘要：

In principle, calculation of a full Green's function in any field theory requires knowledge of the infinite set of multi-point Green's functions, unless one can find some way of truncating the corresponding Schwinger-Dyson equations. For the fermion and boson propagators in QED this requires an {\it ansatz} for the full three point vertex. Here we illustrate how the properties of gauge invariance, gauge covariance and multiplicative renormalizability impose severe constraints on this fermion-boson interaction, allowing a consistent truncation of the propagator equations. We demonstrate how these conditions imply that the 3-point vertex {\bf in the propagator equations} is largely determined by the behaviour of the fermion propagator itself and not by knowledge of the many higher point functions. We give an explicit form for the fermion-photon vertex, which in the fermion and photon propagator fulfills these constraints to all orders in leading logarithms for massless QED, and accords with the weak coupling limit in perturbation theory at ${\cal O}(α)$. This provides the first attempt to deduce non-perturbative Feynman rules for strong physics calculations of propagators in massless QED that ensures a more consistent truncation of the 2-point Schwinger-Dyson equations. The generalisation to next-to-leading order and masses will be described in a longer publication.

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。

↑