Geometry of Lagrangian First-order Classical Field Theories

Details Geometry of Lagrangian First-order Classical Field Theories Geometry of Lagrangian First-order Classical Field Theories

1995-05-17

arxiv.org/abs/dg-ga/9505004v1

Fortsch.Phys.44:235-280,1996

Physics

High Energy Physics

High Energy Physics - Theory

Latex file, 48 pages

Scientific paper

10.1002/prop.2190440304

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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