4.6 Article

Global existence and infinite time blow-up of classical solutions to chemotaxis systems of local sensing in higher dimensions

Journal

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.na.2022.112987

Keywords

Chemotaxis; Keller-Segel system; Global existence

Funding

  1. Japan Society for the Promotion of Science [18K03386, 19K14576]
  2. Grants-in-Aid for Scientific Research [19K14576, 18K03386] Funding Source: KAKEN

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This paper investigates the fully parabolic chemotaxis system of local sensing in higher dimensions. It proves the absence of finite-time blow-up phenomenon in this system even in the supercritical case. For any regular initial data, independently of the magnitude of mass, the classical solution exists globally in time in the higher dimensional setting. In the case of exponential decaying motility, it is established that solutions may blow up at infinite time for any magnitude of mass.
This paper deals with the fully parabolic chemotaxis system of local sensing in higher dimensions. Despite the striking similarity between this system and the Keller-Segel system, we prove the absence of finite-time blow-up phenomenon in this system even in the supercritical case. It means that for any regular initial data, independently of the magnitude of mass, the classical solution exists globally in time in the higher dimensional setting. Moreover, for the exponential decaying motility case, it is established that solutions may blow up at infinite time for any magnitude of mass. In order to prove our theorem, we deal with some auxiliary identity as an evolution equation with a time dependent operator. In view of this new perspective, the direct consequence of the abstract theory is rich enough to establish global existence of the system.

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