Abstract
A condensed introduction to quantum gauge theories is given in the perturbative S-matrix framework, with path-integral methods used nowhere. This approach emphasizes the fact that it is not necessary to start from classical gauge theories that are then subject to quantization: it is possible, instead, to recover the classical group structure and coupling properties from purely quantum-mechanical principles. As a main tool, we use a free-field version of the BecchiRouetStoraTyutin gauge transformation, which contains no interaction terms related to a coupling constant. This free gauge transformation can be formulated in an analogous way for quantum electrodynamics, YangMills theories with massless or massive gauge bosons, and quantum gravity. PACS Nos.: 11.10.z, 11.15.Bt, 12.20.Ds, 12.38.Bx
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