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Paper   IPM / Physic / 9467
School of Physics
  Title:   Perfect and Imperfect Gauge Fixing
  Author(s):  A. Shirzad
  Status:   Published
  Journal: J. Math. Phys.
  Vol.:  48
  Year:  2007
  Pages:   082303
  Supported by:  IPM
  Abstract:
Gauge fixing may be done in different ways. We show that using the chain structure to describe a constrained system, enables us to use either a perfect gauge, in which all gauged degrees of freedom are determined; or an imperfect gauge, in which some first class constraints remain as subsidiary conditions to be imposed on the solutions of the equations of motion. We also show that the number of constants of motion depends on the level in a constraint chain in which the gauge fixing condition is imposed. The relativistic point particle, electromagnetism and the Polyakov string are discussed as examples and perfect or imperfect gauges are distinguished

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