Charges from Dressed Matter: Physics and Renormalisation
Charges from Dressed Matter: Physics and Renormalisation
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来自修饰物质的电荷：物理和重正化
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
D. McMullan
中科院分区：
文献类型：
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作者：
E. Bagan;M. Lavelle;D. McMullan
抽象规范理论的特点是长程相互作用。大量忽略这些相互作用，并将拉格朗日物质场与渐近物理场联系起来，导致了红外问题。在本文中，我们研究了一种物理电荷结构在QED中的微扰应用，其中物质场与相关的电磁云相结合。在一篇配套的论文中，这已经被正式证明包括了这些渐近的相互作用。结果表明，描述这些电荷场的壳层格林函数和S矩阵元在耦合的所有阶次上都具有与粒子传播和散射有关的极点结构。我们详细地证明了重整化过程可以直接进行。结果表明，QED的标准红外有限预测没有改变，推测我们的结构的良好的红外性质可能为以前无法计算的性质的计算开辟了道路。最后简要讨论了这种方法在QCD中的推广。
Abstract Gauge theories are characterised by long range interactions. Neglecting these interactions at large times and identifying the Lagrangian matter fields with the asymptotic physical fields leads to the infrared problem. In this paper we study the perturbative applications of a construction of physical charges in QED, where the matter fields are combined with the associated electromagnetic clouds. This has been formally shown, in a companion paper, to include these asymptotic interactions. It is explicitly demonstrated that the on-shell Green's functions and S-matrix elements describing these charged fields have, to all orders in the coupling, the pole structure associated with particle propagation and scattering. We show in detail that the renormalisation procedure may be carried out straightforwardly. It is shown that standard infrared finite predictions of QED are not altered and it is speculated that the good infrared properties of our construction may open the way to the calculation of previously uncalculable properties. Finally extensions of this approach to QCD are briefly discussed.