TL;DR
This paper reviews how causal gauge principles explain gauge invariance and the emergence of Higgs-like particles without the traditional BEHK mechanism, offering a pedagogical overview of the Zurich school's approach.
Contribution
It provides a pedagogical review of causal gauge principles and their role in explaining gauge invariance and Higgs-like phenomena without the BEHK mechanism.
Findings
Renormalizability explains gauge invariance in gauge theories.
Massive gauge fields can produce Higgs-like particles without BEHK.
The Zurich school's approach offers an alternative perspective on gauge symmetry.
Abstract
Work by the Zurich school of causal (Epstein-Glaser) renormalization has shown that renormalizability in the presence of massless or massive gauge fields (as primary entities) explains gauge invariance and, in some instances, the presence of a Higgs-like particle, without the Brout-Englert-Higgs-Kibble (BEHK) mechanism. We review that work, in a pedagogical vein, with a pointer to go beyond.
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