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Geometry of Lagrangian First-order Classical Field Theories

Arturo Echeverría-Enríquez·Miguel C. Muñoz-Lecanda·Narciso Román-Roy
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Abstract

We construct a lagrangian geometric formulation for first-order field theories using the canonical structures of first-order jet bundles, which are taken as the phase spaces of the systems in consideration. First of all, we construct all the geometric structures associated with a first-order jet bundle and, using them, we develop the lagrangian formalism, defining the canonical forms associated with a lagrangian density and the density of lagrangian energy, obtaining the {\sl Euler-Lagrange equations} in two equivalent ways: as the result of a variational problem and developing the {\sl jet field formalism} (which is a formulation more similar to the case of mechanical systems). A statement and proof of Noether's theorem is also given, using the latter formalism. Finally, some classical examples are briefly studied.

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BibTeXRIS

Arturo Echeverría-Enríquez, Miguel C. Muñoz-Lecanda, Narciso Román-Roy. 1995-05-17. Geometry of Lagrangian First-order Classical Field Theories. https://doi.org/10.1002/prop.2190440304

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