Some properties of the solutions of wave equations |
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Authors: | L J F Broer and L A Peletier |
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Institution: | (1) Dept. of Physics, Technological University, Eindhoven, The Netherlands;(2) Present address: the University of Sussex, Brighton, England |
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Abstract: | Some properties of solutions of initial value problems and mixed initial-boundary value problems of a class of wave equations are discussed. Wave modes are defined and it is shown that for the given class of wave equations there is a one to one correspondence with the roots
i
(k) or k
j
() of the dispersion relation W(, k)=0. It is shown that solutions of initial value problems cannot consist of single wave modes if the initial values belong to W
2
1
(–, ); generally such solutions must contain all possible modes. Similar results hold for solutions of mixed initial-boundary value problems. It is found that such solutions are stable, even if some of the singularities of the functions k
j
() lie in the upper half of the plane. The implications of this result for the Kramers-Kronig relations are discussed. |
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Keywords: | |
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