Infinite time aggregation for the critical Patlak-Keller-Segel model in ℝ2

Adrien Blanchet, José A. Carrillo, Nader Masmoudi

Research output: Contribution to journalArticlepeer-review


We analyze the two-dimensional parabolic-elliptic Patlak-Keller-Segel model in the whole Euclidean space ℝ2. Under the hypotheses of integrable initial data with finite second moment and entropy, we first show local-in-time existence for any mass of "free-energy solutions," namely weak solutions with some free-energy estimates. We also prove that the solution exists as long as the entropy is controlled from above. The main result of the paper is to show the global existence of free-energy solutions with initial data as before for the critical mass 8π/χ. Actually, we prove that solutions blow up as a delta Dirac at the center of mass when t → ∞ when their second moment is kept constant at any time. Furthermore, all moments larger than 2 blowup as t → ∞ if initially bounded.

Original languageEnglish (US)
Pages (from-to)1449-1481
Number of pages33
JournalCommunications on Pure and Applied Mathematics
Issue number10
StatePublished - Oct 2008

ASJC Scopus subject areas

  • General Mathematics
  • Applied Mathematics


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