Global well-posedness of slightly supercritical active scalar equations

Details Global well-posedness of slightly supercritical active scalar equations Global well-posedness of slightly supercritical active scalar equations

2012-03-28

arxiv.org/abs/1203.6302v1

Mathematics

Analysis of PDEs

Scientific paper

The paper is devoted to the study of slightly supercritical active scalars with nonlocal diffusion. We prove global regularity for the surface quasi-geostrophic (SQG) and Burgers equations, when the diffusion term is supercritical by a symbol with roughly logarithmic behavior at infinity. We show that the result is sharp for the Burgers equation. We also prove global regularity for a slightly supercritical two-dimensional Euler equation. Our main tool is a nonlocal maximum principle which controls a certain modulus of continuity of the solutions.

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