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Invariance identities associated with finite gauge transformations and the uniqueness of the equations of motion of a particle in a classical gauge field

  • Invited Papers Dedicated to Eugene Paul Wigner
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Abstract

A certain class of geometric objects is considered against the background of a classical gauge field associated with an arbitrary structural Lie group. It is assumed that the components of these objects depend on the gauge potentials and their first derivatives, and also on certain gauge-dependent parameters whose properties are suggested by the interaction of an isotopic spin particle with a classical Yang-Mills field. It is shown that the necessary and sufficient conditions for the invariance of the given objects under a finite gauge transformation are embodied in a set of three relations involving the derivatives of their components. As a special case these so-called invariance identities indicate that there cannot exist a gauge-invariant Lagrangian that depends on the gauge potentials, the interaction parameters, and the4-velocity components of a test particle. However, the requirement that the equations of motion that result from such a Lagrangian be gauge-invariant, uniquely determines the structure of these equations.

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Rund, H. Invariance identities associated with finite gauge transformations and the uniqueness of the equations of motion of a particle in a classical gauge field. Found Phys 13, 93–114 (1983). https://doi.org/10.1007/BF01889414

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  • DOI: https://doi.org/10.1007/BF01889414

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