Decaying states of perturbed wave equations |
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Authors: | Jeffrey Rauch Michael Taylor |
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Institution: | Department of Mathematics, University of Michigan, Ann Arbor, Michigan 48104 USA |
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Abstract: | We study the solutions of perturbed wave equations that represent free wave motion outside some ball. When there are no trapped rays, it is shown that every solution whose total energy decays to zero must be smooth. This extends results of Rauch to the even-dimensional case and to systems having more than one sound speed. In these results, obstacles are not considered. We show that, even allowing obstacles, waves with compact spatial support cannot decay, assuming a unique continuation hypothesis. An example with obstacle is given where nonsmooth, compactly supported, decaying waves exist. |
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Keywords: | 35P25 35B40 energy decay Radon transform wavefront set |
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