Gauge Symmetries and Fibre Bundles
A.P. Balachandran, G. Marmo, B.-S. Skagerstam, A. Stern
A theory defined by an action which is invariant under a time dependent group of transformations can be called a gauge theory. Well known examples of such theories are those defined by the Maxwell and Yang-Mills Lagrangians. It is widely believed nowadays that the fundamental laws of physics have to be formulated in terms of gauge theories.
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