We study the quantization of gauge theories by giving a central role to the Becchi-Rouet-
Stora (BRS) symmetry. We analyze as far as possible the case of a general gauge theory …

These notes essentially reproduce lectures given at the International School for Advanced
Studies (Trieste) and at the Scuola Normale Superiore (Pisa) on various occasions. The …

The paper interprets and proves the charge superselection rule within the framework of local
relativistic field theory as the statement that the charge operator commutes with all …

Quantum Field Theory (QFT) has proved to be the most useful strategy for the description of
elementary particle interactions and as such is regarded as a fundamental part of modern …

The principal intent of this monograph is to present in a systematic and self-con tained
fashion the basic tenets, ideas and results of a framework for the consistent unification of …

Charge operator and charged sectors in four-dimensional QED are investigated, both within
a local, covarian (indefinite metric), and within a positive metric formulation of QED …

A bstract A non-perturbative and exactly solvable quantum field theoretical model for a
“dressed Dirac field” is presented, that exhibits all the kinematical features of QED: an …

String-localized quantum field theory allows renormalizable couplings involving massive
vector bosons, without invoking negative-norm states and compensating ghosts. We analyze …

General structure properties of local and covariant gauge quantum field theories are
investigated and a generalized cluster property is proved. Necessary and sufficient …

Physics Collision Theory for Massless Bosons Page 1 Communications in Commun. math.
Phys. 52,147—173 (1977) Mathematical Physics © by Springer-Verlag 1977 Collision Theory …