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00925njm 22002777a 4500 dc Castrillón López, Marco author Gotay, Mark J author Marsden, Jerrold E author 2008 We give an exposition of the 1972 parametrization method of Kuchar in the context of the multisymplectic approach to field theory. The purpose of the formalism developed here is to make any classical field theory, containing a metric as a sole background field, generally covariant (that is, parametrized, with the spacetime diffeomorphism group as a symmetry group) as well as fully dynamic. This is accomplished by introducing certain covariance fields as genuine dynamic fields. As we shall see, the multimomenta conjugate to these new fields form the Piola–Kirchhoff version of the stress–energy–momentum tensor field, and their Euler–Lagrange equations are vacuously satisfied. Thus, these fields have no additional physical content; they serve only to provide an efficient means of parametrizing the theory. Our results are illustrated with two examples, namely an electromagnetic field and a Klein–Gordon vector field, both on a background spacetime. 1751-8113 10.1088/1751-8113/41/34/344002 https://hdl.handle.net/20.500.14352/50722 http://iopscience.iop.org/1751-8121/41/34/344002/pdf/1751-8121_41_34_344002.pdf http://iopscience.iop.org Parametrization and Stress–Energy–Momentum Tensors in Metric Field Theories