Critical Keller-Segel meets Burgers on ${\mathbb{S}}^1$: large-time smooth solutions

Abstract

We show that solutions to the parabolic-elliptic Keller-Segel system on ${\mathbb{S}}^1$ with critical fractional diffusion $(-\Delta {)}^{\frac{1}{2}}$ remain smooth for any initial data and any positive time. This disproves, at least in the periodic setting, the large-data-blowup conjecture by Bournaveas and Calvez. As a tool, we show smoothness of solutions to a modified critical Burgers equation via a generalization of the method of moduli of continuity by Kiselev, Nazarov and Shterenberg. over a setting where the considered equation has no scaling. This auxiliary result may be interesting by itself. Finally, we study the asymptotic behavior of global solutions, improving the existing results.

17 pages

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• Global well-posedness for the critical 2D dissipative quasi-geostrophic equation
• The fractional Keller-Segel model
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Cited by in corpus (1)

• Boundedness of solutions to the critical fully parabolic quasilinear one-dimensional Keller-Segel system