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Variations by generalized symmetries of local Noether strong currents equivalent to global canonical Noether currents
Communications in Mathematics, Tome 24 (2016) no. 2, pp. 125-135 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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We will pose the inverse problem question within the Krupka variational sequence framework. In particular, the interplay of inverse problems with symmetry and invariance properties will be exploited considering that the cohomology class of the variational Lie derivative of an equivalence class of forms, closed in the variational sequence, is trivial. We will focalize on the case of symmetries of globally defined field equations which are only locally variational and prove that variations of local Noether strong currents are variationally equivalent to global canonical Noether currents. Variations, taken to be generalized symmetries and also belonging to the kernel of the second variational derivative of the local problem, generate canonical Noether currents -- associated with variations of local Lagrangians -- which in particular turn out to be conserved \emph {along any section}. We also characterize the variation of the canonical Noether currents associated with a local variational problem.
We will pose the inverse problem question within the Krupka variational sequence framework. In particular, the interplay of inverse problems with symmetry and invariance properties will be exploited considering that the cohomology class of the variational Lie derivative of an equivalence class of forms, closed in the variational sequence, is trivial. We will focalize on the case of symmetries of globally defined field equations which are only locally variational and prove that variations of local Noether strong currents are variationally equivalent to global canonical Noether currents. Variations, taken to be generalized symmetries and also belonging to the kernel of the second variational derivative of the local problem, generate canonical Noether currents -- associated with variations of local Lagrangians -- which in particular turn out to be conserved \emph {along any section}. We also characterize the variation of the canonical Noether currents associated with a local variational problem.
Classification : 55N30, 55R10, 58A12, 58A20, 58E30, 70S10
Keywords: fibered manifold; jet space; Lagrangian formalism; variational sequence; second variational derivative. cohomology; symmetry; conservation law 
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     author = {Palese, Marcella},
     title = {Variations by generalized symmetries of local {Noether} strong currents equivalent to global canonical {Noether} currents},
     journal = {Communications in Mathematics},
     pages = {125--135},
     year = {2016},
     volume = {24},
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     language = {en},
     url = {http://geodesic.mathdoc.fr/item/COMIM_2016_24_2_a3/}
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Palese, Marcella. Variations by generalized symmetries of local Noether strong currents equivalent to global canonical Noether currents. Communications in Mathematics, Tome 24 (2016) no. 2, pp. 125-135. http://geodesic.mathdoc.fr/item/COMIM_2016_24_2_a3/

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