Conserved densities for linear evolution systems |
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| Authors: | L. Abellanas A. Galindo |
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| Affiliation: | (1) Department of Theoretical Physics, Universidad Complutense, Madrid-3, Spain |
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| Abstract: | A general discussion of the conservation laws for simple linear evolution systems is presented. The analysis is based upon an extension of the Gel'fand-Dikii symbolic algorithm to cover pseudo-differential operators. These techniques are applied to obtain all the conserved densities  [u] for the free Klein-Gordon and Dirac equations with nonzero mass. |
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