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Exponential averaging or Hamiltonian evolution equations
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UNSPECIFIED (2003) Exponential averaging or Hamiltonian evolution equations. TRANSACTIONS OF THE AMERICAN MATHEMATICAL SOCIETY, 355 (2). pp. 747-773.
Full text not available from this repository, contact author.Abstract
We derive estimates on the magnitude of non-adiabatic interaction between a Hamiltonian partial differential equation and a high-frequency nonlinear oscillator. Assuming spatial analyticity of the initial conditions, we show that the dynamics can be transformed to the uncoupled dynamics of an infinite-dimensional Hamiltonian system and an anharmonic oscillator, up to coupling terms which are exponentially small in a certain power of the frequency of the oscillator. The result is derived from an abstract averaging theorem for infinite-dimensional analytic evolution equations in Gevrey spaces. Re ning upon a similar result by Neishtadt for analytic ordinary differential equations, the temporal estimate crucially depends on the spatial regularity of the initial condition. The result shows to what extent the strong resonances between rapid forcing and highly oscillatory spatial modes can be suppressed by the choice of sufficiently smooth initial data. An application is provided by a system of nonlinear Schrodinger equations, coupled to a rapidly forcing single mode, representing small-scale oscillations. We provide an example showing that the estimates for partial differential equations we derive here are necessarily different from those in the context of ordinary differential equations.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QA Mathematics | ||||
| Journal or Publication Title: | TRANSACTIONS OF THE AMERICAN MATHEMATICAL SOCIETY | ||||
| Publisher: | AMER MATHEMATICAL SOC | ||||
| ISSN: | 0002-9947 | ||||
| Official Date: | 2003 | ||||
| Dates: |
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| Volume: | 355 | ||||
| Number: | 2 | ||||
| Number of Pages: | 27 | ||||
| Page Range: | pp. 747-773 | ||||
| Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
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