Abstract
A time-dependent determining wavenumber was introduced in Cheskidov and Dai (Phys D Nonlinear Phenom 376–377:204–215, 2018) to estimate the number of determining modes for the surface quasi-geostrophic equation. In this paper we continue this investigation focusing on the subcritical case and study trajectories inside an absorbing set bounded in \(L^\infty \). Utilizing this bound we find a time-independent determining wavenumber that improves the estimate obtained in Cheskidov and Dai (Phys D Nonlinear Phenom 376–377:204–215, 2018). This classical approach is more direct, but it is contingent on the existence of the \(L^\infty \) absorbing set.
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The authors would wish to express their gratitude to the anonymous referee for the careful review and valuable suggestions which helped to improve the manuscript a lot.
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The work of A. Cheskidov was partially supported by NSF grants DMS–1108864 and DMS–1517583. The work of M. Dai was partially supported by NSF Grant DMS–1815069.
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Cheskidov, A., Dai, M. On the Determining Wavenumber for the Nonautonomous Subcritical SQG Equation. J Dyn Diff Equat 32, 1511–1525 (2020). https://doi.org/10.1007/s10884-019-09794-7
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DOI: https://doi.org/10.1007/s10884-019-09794-7