The Stueckelberg action is a theoretical framework used in quantum field theory to incorporate massive vector bosons in a gauge-invariant manner. It was introduced by Ernst Stueckelberg in the 1930s. The main idea behind the Stueckelberg mechanism is to modify the standard gauge theory, which typically describes massless particles (like the photons in electromagnetism), to allow the introduction of mass for gauge bosons while maintaining gauge invariance.
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