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Quasi-stationary solutions of the surface quasi-geostrophic equation

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arxiv 2105.00737 v1 pith:KH2VB4OW submitted 2021-05-03 math.AP

classification math.AP
keywords solutionsequationalphakappaproblemquasi-geostrophicquasi-stationarysurface
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abstract

In the present study, we find that the surface quasi-geostrophic equation admits exact solutions, which evolve with time in quasi-stationary states. The solutions presented are available for any dissipation effect $\kappa (-\Delta)^\alpha$ ($\kappa >0$, $0\le \alpha <1$), involved in the equation. When the equation is supercritical ($0\le \alpha <\frac12$), the problem on the existence of large global regular solutions remains open. This study, however, provides explicit sample solutions for the understanding of the uncertain problem.

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  1. Neutral curves and traveling waves in plane Poiseuille flow

    math.AP 2026-07 conditional novelty 7.0 of 10

    Rigorous proof that the lower and upper neutral branches of plane Poiseuille flow obey ν ~ α^7 and ν ~ α^11, with simple eigenvalues and transversal crossing, yielding traveling-wave bifurcation.

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