Infrared Effects and the Soft Photon Theorem in Massive QED
Govindarajan T R, Nikhil Kalyanapuram
TL;DR
This paper explores how the Stueckelberg formulation of massive QED sheds light on infrared issues and asymptotic symmetries, connecting these to the soft photon theorem as the photon mass approaches zero.
Contribution
It demonstrates the role of Stueckelberg fields in resolving infrared problems and revealing new asymptotic symmetries in massive QED as the photon mass tends to zero.
Findings
Stueckelberg fields help address infrared divergences.
New asymptotic symmetries emerge in the massless limit.
Soft photon theorems are linked to these symmetries.
Abstract
Stueckelberg QED with massive photon is known to be renormalizable. But the limit of the mass going to zero is interesting because it brings the resolution to infrared questions through the role of Stueckelberg field at null infinity in addition to providing new asymptotic symmetries. Such symmetries facilitate the soft photon theorems also.
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