Singularity Structure of EqualTime Commutators
Abstract
On the basis of simple dimensional considerations, it is argued that equaltime commutators as calculated canonically are, in general, not sufficiently singular. This general result is then verified in a number of examples of interest by computing the vacuum expectation values of the commutators in perturbation theory. Specific cases discussed are the electromagnetic current in spinor, scalar, and Pauli electrodynamics and the "new, improved" stressenergy tensor for a free scalar field.
 Publication:

Physical Review D
 Pub Date:
 June 1971
 DOI:
 10.1103/PhysRevD.3.2985
 Bibcode:
 1971PhRvD...3.2985R