%0 Book Section
%T Gauge invariant variationally trivial U(1)-problems.
publisher Masaryk University
%D 1999
%U 80-210-2097-0
%@ https://hdl.handle.net/20.500.14352/60805
%X One of the classical problems in the theory of variational calculus is the so-called equivalence problem, which studies whether two Lagrangians L, L′, defined in the 1-jet prolongation of a given bundle, determine the same variational problem. This problem is equivalent to studying the variational triviality of the difference L−L′.    On the other hand, the notion of gauge invariance plays a relevant role in the theory of fields, in particular in electromagnetism, in which the structure group is the abelian group U(1).    In this framework, the author gives a geometric characterization of the trivial variational problems defined on the bundle of connections of an arbitrary U(1)-principal bundle which are gauge-invariant. It turns out that there is a one-to-one correspondence between the set of these problems and the set of multivector fields χ on the ground manifold M which are divergence-free, that is, Lχv=0, v being a fixed volume form on M.
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