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• W3203453268 abstract "<p style='text-indent:20px;'>This paper studies a family of generalized surface quasi-geostrophic (SQG) equations for an active scalar <inline-formula><tex-math id=M1>begin{document}$ theta $end{document}</tex-math></inline-formula> on the whole plane whose velocities have been mildly regularized, for instance, logarithmically. The well-posedness of these regularized models in borderline Sobolev regularity have previously been studied by D. Chae and J. Wu when the velocity <inline-formula><tex-math id=M2>begin{document}$ u $end{document}</tex-math></inline-formula> is of lower singularity, i.e., <inline-formula><tex-math id=M3>begin{document}$ u = -nabla^{perp} Lambda^{ beta-2}p( Lambda) theta $end{document}</tex-math></inline-formula>, where <inline-formula><tex-math id=M4>begin{document}$ p $end{document}</tex-math></inline-formula> is a logarithmic smoothing operator and <inline-formula><tex-math id=M5>begin{document}$ beta in [0, 1] $end{document}</tex-math></inline-formula>. We complete this study by considering the more singular regime <inline-formula><tex-math id=M6>begin{document}$ betain(1, 2) $end{document}</tex-math></inline-formula>. The main tool is the identification of a suitable linearized system that preserves the underlying commutator structure for the original equation. We observe that this structure is ultimately crucial for obtaining continuity of the flow map. In particular, straightforward applications of previous methods for active transport equations fail to capture the more nuanced commutator structure of the equation in this more singular regime. The proposed linearized system nontrivially modifies the flux of the original system in such a way that it coincides with the original flux when evaluated along solutions of the original system. The requisite estimates are developed for this modified linear system to ensure its well-posedness.</p>" @default.
• W3203453268 created "2021-10-11" @default.
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• W3203453268 date "2021-01-01" @default.
• W3203453268 modified "2023-10-17" @default.
• W3203453268 title "On local well-posedness of logarithmic inviscid regularizations of generalized SQG equations in borderline Sobolev spaces" @default.
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• W3203453268 doi "https://doi.org/10.3934/cpaa.2021169" @default.
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