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Proceedings of the American Mathematical Society

Published by the American Mathematical Society since 1950, Proceedings of the American Mathematical Society is devoted to shorter research articles in all areas of pure and applied mathematics.

ISSN 1088-6826 (online) ISSN 0002-9939 (print)

The 2020 MCQ for Proceedings of the American Mathematical Society is 0.85.

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Critical mass on the Keller-Segel system with signal-dependent motility
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by Hai-Yang Jin and Zhi-An Wang PDF
Proc. Amer. Math. Soc. 148 (2020), 4855-4873 Request permission

Abstract:

This paper is concerned with the global boundedness and blow-up of solutions to the Keller-Segel system with density-dependent motility in a two-dimensional bounded smooth domain with Neumman boundary conditions. We show that if the motility function decays exponentially, then a critical mass phenomenon similar to the minimal Keller-Segel model will arise. That is, there is a number $m_*>0$, such that the solution will globally exist with uniform-in-time bound if the initial cell mass (i.e., $L^1$-norm of the initial value of cell density) is less than $m_*$, while the solution may blow up if the initial cell mass is greater than $m_*$.
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Additional Information
  • Hai-Yang Jin
  • Affiliation: Department of Mathematics, South China University of Technology, Guangzhou 510640, People’s Republic of China
  • Email: mahyjin@scut.edu.cn
  • Zhi-An Wang
  • Affiliation: Department of Applied Mathematics, Hong Kong Polytechnic University, Hung Hom, Hong Kong
  • MR Author ID: 686941
  • Email: mawza@polyu.edu.hk
  • Received by editor(s): August 2, 2019
  • Received by editor(s) in revised form: January 28, 2020, March 4, 2020, and April 3, 2020
  • Published electronically: July 29, 2020
  • Additional Notes: The research of the first author was supported by the NSF of China No. 11871226 and the Fundamental Research Funds for the Central Universities.
    The research of the second author was supported by an internal grant ZZHY from the Hong Kong Polytechnic University.
  • Communicated by: Ryan Hynd
  • © Copyright 2020 American Mathematical Society
  • Journal: Proc. Amer. Math. Soc. 148 (2020), 4855-4873
  • MSC (2010): Primary 35A01, 35B44, 35K57, 35Q92, 92C17
  • DOI: https://doi.org/10.1090/proc/15124
  • MathSciNet review: 4143400