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On Dirac's incomplete analysis of gauge transformations | | Josep M. Pons
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16 Sep 2004 | | Subject: | History of Physics; Mathematical Physics | physics.hist-ph gr-qc hep-th math-ph math.MP | | Abstract: | Dirac’s approach to gauge symmetries is discussed. We follow closely the steps that led him from his conjecture concerning the generators of gauge transformations {it at a given time} --to be contrasted with the common view of gauge transformations as maps from solutions of the equations of motion into other solutions-- to his decision to artificially modify the dynamics, substituting the extended Hamiltonian (including all first-class constraints) for the total Hamiltonian (including only the primary first-class constraints). We show in detail that Dirac’s analysis was incomplete and, in completing it, we prove that the fulfilment of Dirac’s conjecture --in the "non-pathological" cases-- does not imply any need to modify the dynamics. We give a couple of simple but significant examples. | | Source: | arXiv, physics/0409076 | | Services: | Forum | Review | PDF | Favorites | |
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