Gevrey regularity for the supercritical quasi-geostrophic equation
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2014-06-13
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Citation of Original Publication
Biswas, Animikh. “Gevrey Regularity for the Supercritical Quasi-Geostrophic Equation.” Journal of Differential Equations 257, no. 6 (September 15, 2014): 1753–72. https://doi.org/10.1016/j.jde.2014.05.013.
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Abstract
In this paper, following the techniques of Foias and Temam, we establish suitable Gevrey class regularity of solutions to the supercritical quasi-geostrophic equations in the whole space, with initial data in “critical” Sobolev spaces. Moreover, the Gevrey class that we obtain is “near optimal” and as a corollary, we obtain temporal decay rates of higher order Sobolev norms of the solutions. Unlike the Navier–Stokes or the subcritical quasi-geostrophic equations, the low dissipation poses a difficulty in establishing Gevrey regularity. A new commutator estimate in Gevrey classes, involving the dyadic Littlewood–Paley operators, is established that allow us to exploit the cancellation properties of the equation and circumvent this difficulty.