2026-06-27T10:26:55Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/507222023-08-26T12:19:04Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Castrillón López, Marco
author
Gotay, Mark J
author
Marsden, Jerrold E
2023-06-20T10:36:02Z
2023-06-20T10:36:02Z
2008
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
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.
eng
Parametrization and Stress–Energy–Momentum Tensors in Metric Field Theories
journal article
URL
https://docta.ucm.es/bitstreams/31f2cb6e-60c3-4a5f-8638-37c454325097/download
File
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f07a83d41f3f63faf5ba881c8707e92f
212550
application/pdf
Castrillón-Parametrization.pdf