English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We continue the investigation of quantized Yang-Mills theories coupled tomatter fields in the framework of causal perturbation theory which goes back toEpstein and Glaser. In this approach gauge invariance is expressed by a simplecommutator relation for the S-matrix and the corresponding gaugetransformations are simple transformations of the free fields only. In spite ofthis simplicity, gauge invariance implies the usual Slavnov-Taylor identities.The main purpose of this paper is to prove the latter statement. Since theSlavnov-Taylor identities are formulated in terms of Green's functions, weinvestigate the agreement of two perturbative definitions of Green's functions,namely of Epstein and Glaser's definition with the Gell-Mann Low series.Comment: 29 pages. The paper is written in TEX. The necessary macros are  included. The figures are not done by computer, they can be ordered at the  authors addres

Slavnov–Taylor Identities from the Causal Point of View