Floquet problem and center manifold reduction for ordinary differential operators with periodic coefficients in Hilbert spaces
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- by V. Kozlov and J. Taskinen
- St. Petersburg Math. J. 32, 531-550
- DOI: https://doi.org/10.1090/spmj/1660
- Published electronically: May 11, 2021
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Abstract:
A first order differential equation with a periodic operator coefficient acting in a pair of Hilbert spaces is considered. This setting models both elliptic equations with periodic coefficients in a cylinder and parabolic equations with time periodic coefficients. Our main results are a construction of a pointwise projector and a spectral splitting of the system into a finite-dimensional system of ordinary differential equations with constant coefficients and an infinite-dimensional part whose solutions have better properties in a certain sense. This complements the well-known asymptotic results for periodic hypoelliptic problems in cylinders and for elliptic problems in quasicylinders obtained by P. Kuchment and S. A. Nazarov, respectively.
As an application, a center manifold reduction is presented for a class of nonlinear ordinary differential equations in Hilbert spaces with periodic coefficients. This result generalizes the known case with constant coefficients explored by A. Mielke.
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Bibliographic Information
- V. Kozlov
- Affiliation: Department of Mathematics, Linköping University, S–581 83 Linköping, Sweden
- Email: vladimir.kozlov@liu.se
- J. Taskinen
- Affiliation: Department of Mathematics and Statistics, University of Helsinki, P.O.Box 68, 00014 Helsinki, Finland
- MR Author ID: 170995
- Email: jari.taskinen@helsinki.fi
- Received by editor(s): May 7, 2019
- Published electronically: May 11, 2021
- Additional Notes: The first author was supported by the Swedish Research Council (VR), 2017-03837. The second author was supported by a research grant from the Faculty of Science of the University of Helsinki.
- © Copyright 2021 American Mathematical Society
- Journal: St. Petersburg Math. J. 32, 531-550
- MSC (2020): Primary 37L10
- DOI: https://doi.org/10.1090/spmj/1660
- MathSciNet review: 4099099
Dedicated: Dedicated to Nina Nikolaevna Ural’tseva on the occasion of her $85$th birthday.