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Existence and Stability of Periodic and Almost Periodic Solutions to the Boussinesq System in Unbounded Domains

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In this paper we investigate the existence and stability of periodic solutions (on a half-line ℝ+) and almost periodic solutions on the whole line time-axis ℝ to the Boussinesq system on several classes of unbounded domains of ℝn in the framework of interpolation spaces. For the linear Boussinesq system we combine the LpLq-smoothing estimates and interpolation functors to prove the existence of bounded mild solutions. Then, we prove the existence of periodic solutions by invoking Massera’s principle. We also prove the existence of almost periodic solutions. Then we use the results of the linear Boussinesq system to establish the existence, uniqueness and stability of the small periodic and almost periodic solutions to the Boussinesq system using fixed point arguments and interpolation spaces. Our results cover and extend the previous ones obtained in [13, 34, 38].

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Correspondence to Thieu Huy Nguyen.

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This work was financially supported by the Vietnam National Foundation for Science and Technology Development under grant number 101.02-2021.04. The work of the last author was financially supported by Vietnam Ministry of Education and Training under Project B2022-BKA-06.

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Nguyen, T.H., Pham, T.X., Vu, T.N.H. et al. Existence and Stability of Periodic and Almost Periodic Solutions to the Boussinesq System in Unbounded Domains. Acta Math Sci 42, 1875–1901 (2022). https://doi.org/10.1007/s10473-022-0510-4

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  • DOI: https://doi.org/10.1007/s10473-022-0510-4

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