On the occurrence of mass in field theory

Details On the occurrence of mass in field theory On the occurrence of mass in field theory

2000-08-30

arxiv.org/abs/hep-th/0008229v9

Found.Phys.32:1459-1483,2002; Erratum-ibid.34:189,2004

Physics

High Energy Physics

High Energy Physics - Theory

37 pages, plain Tex. Equation (4.8) has been amended

Scientific paper

10.1023/A:1020363907605 10.1007/

This paper proves that it is possible to build a Lagrangian for quantum electrodynamics which makes it explicit that the photon mass is eventually set to zero in the physical part on observational ground. Gauge independence is achieved upon considering the joint effect of gauge-averaging term and ghost fields. It remains possible to obtain a counterterm Lagrangian where the only non-gauge-invariant term is proportional to the squared divergence of the potential, while the photon propagator in momentum space falls off like 1 over (k-squared) at large k, which indeed agrees with perturbative renormalizability. The resulting radiative corrections to the Coulomb potential in QED are also shown to be gauge-independent. The experience acquired with quantum electrodynamics is used to investigate properties and problems of the extension of such ideas to non-Abelian gauge theories.

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