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- W2283867267 abstract "ABSTRACTA semilinear wave equation with slowly varying wave speed is considered in one to three space dimensions on a bounded interval, a rectangle or a box, respectively. It is shown that the action, which is the harmonic energy divided by the wave speed and multiplied with the diameter of the spatial domain, is an adiabatic invariant: it remains nearly conserved over long times, longer than any fixed power of the time scale of changes in the wave speed in the case of one space dimension, and longer than can be attained by standard perturbation arguments in the two- and three-dimensional cases. The long-time near-conservation of the action yields long-time existence of the solution. The proofs use modulated Fourier expansions in time." @default.
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- W2283867267 date "2016-09-20" @default.
- W2283867267 modified "2023-09-30" @default.
- W2283867267 title "Long-term analysis of semilinear wave equations with slowly varying wave speed" @default.
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- W2283867267 doi "https://doi.org/10.1080/03605302.2016.1235581" @default.
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