
Accession Number : AD0747695
Title : Gauge Invariant Vacuum Polarization.
Descriptive Note : Technical rept.,
Corporate Author : MARYLAND UNIV COLLEGE PARK CENTER FOR THEORETICAL PHYSICS
Personal Author(s) : Ferrell,Richard A.
Report Date : APR 1970
Pagination or Media Count : 11
Abstract : Because of its highly singular nature, the current operator in relativistic quantum electrodynamics has to be defined by a limiting process. If gauge invariance is satisfied at every stage of this process, an additional quadratically divergent term appears in the polarizability tensor. As noted by Johnson, this new term is identical to the counter term invoked in less rigorous treatments, in order to keep the photon mass equal to zero and to satisfy gauge invariance. The author presents here an alternative derivation of Johnson's result which is based on Ward's identity and which employs notions gnerally familiar to students of relativistic quantum mechanics. (Author)
Descriptors : (*QUANTUM THEORY, INVARIANCE), OPERATORS(MATHEMATICS), RELATIVITY THEORY, POLARIZATION, PERTURBATION THEORY
Subject Categories : Quantum Theory and Relativity
Distribution Statement : APPROVED FOR PUBLIC RELEASE