Collapsing-ring blowup solutions for the Keller-Segel system in three dimensions and higher - Archive ouverte HAL
Pré-Publication, Document De Travail Année : 2022

Collapsing-ring blowup solutions for the Keller-Segel system in three dimensions and higher

Résumé

We consider the parabolic-elliptic Keller-Segel system in three dimensions and higher, corresponding to the mass supercritical case. We construct rigorously a solution which blows up in finite time by having its mass concentrating near a ring that shrinks to a point. In particular, the singularity is of type II, non self-similar. We show the stability of this dynamics among spherically symmetric solutions. In renormalised variables, the solution ressembles a traveling wave imploding at the origin, and this, to our knowledge, is the first stability result for such phenomenon for an evolution PDE. We develop a framework to handle the interactions between the two blowup zones contributing to the mechanism: a thin inner zone around the ring where viscosity effects occur, and an outer zone where the evolution is mostly inviscid.

Dates et versions

hal-03811436 , version 1 (11-10-2022)

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Charles Collot, Tej-Eddine Ghoul, Nader Masmoudi, van Tien Nguyen. Collapsing-ring blowup solutions for the Keller-Segel system in three dimensions and higher. 2022. ⟨hal-03811436⟩
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