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- W1972497712 abstract "This paper describes a new approach to global smoothing problems for dispersive and non-dispersive evolution equations based on the global canonical transforms and the underlying global microlocal analysis. For this purpose, the Egorov-type theorem is established with canonical transformations in the form of a class of Fourier integral operators, and their weighted L2-boundedness properties are derived. This allows us to globally reduce general dispersive equations to normal forms in one or two dimensions. Then, a new comparison principle for evolution equations is introduced. In particular, it allows us to relate different smoothing estimates by comparing certain expressions involving their symbols. As a result, it is shown that the majority of smoothing estimates for different equations are equivalent to each other. Moreover, new estimates as well as several refinements of known results are obtained. The proofs are considerably simplified. A comprehensive analysis is presented for smoothing estimates for dispersive equations. Applications are given to the detailed description of smoothing properties of the Schrödinger, relativistic Schrödinger, wave, Klein–Gordon and other equations." @default.
- W1972497712 created "2016-06-24" @default.
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- W1972497712 date "2012-03-13" @default.
- W1972497712 modified "2023-09-25" @default.
- W1972497712 title "Smoothing properties of evolution equations via canonical transforms and comparison principle" @default.
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- W1972497712 doi "https://doi.org/10.1112/plms/pds006" @default.
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