User:Johnjbarton/sandbox/standard model

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Gauge theories Penrose pg 451-455.

Weyl's theory generalizes the concept of length in classical field.
Weyl's gauge transformation failed for EM because mass would be history dependent.
QM uses scaling by $e^{i\theta }$ , avoiding the mass-history issue.
$\psi \rightarrow e^{i\theta }\psi$ symmetry in EM
Yang-mills is generalization of EM; the basis of QCD (pg 649)
gauge bosons of QCD are gluons, analogs of photons.