D. R. Grigore, O. T. Popp, Dept. of Theor. Phys., Inst. Atomic Phys., Bucharest-Magurele, P. O. Box MG 6, Romania, e-mail: grigore@theor1.ifa.ro, grigore@roifa.ifa.ro
Abstract: The Euler-Lagrange equations are given in a geometrized framework using a differential form related to the Poincare-Cartan form. This new differential form is intrinsically characterized; the present approach does not suppose a distinction between the field and the space-time variables (i.e. a fibration). In connection with this problem we give another proof describing the most general Lagrangian leading to identically vanishing Euler-Lagrange equations. This gives the possibility to have a geometric point of view of the usual Noetherian symmetries for classical field theories and strongly supports the usefulness of the above mentioned differential form.
Keywords: Lagrangian formalism, classical field theory, Noetherian symmetries
Classification (MSC 1991): 58F05, 70H35
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