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Eventual smoothness of generalized solutions to a singular chemotaxis system for urban crime in space dimension 2
Electronic Research Archive 2023, 31(6): 3218-3244
Published: 15 June 2023
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This paper is concerned with a chemotaxis system in a two-dimensional setting as follows:

{ u t = Δ u χ ( u ln v ) κ u v + r u μ u 2 + h 1 , v t = Δ v v + u v + h 2 , ( )

with the parameters χ , κ , μ > 0 and r R , and with the given functions h 1 , h 2 0. This model was originally introduced by Short et al for urban crime with the particular values χ = 2 , r = 0 and μ = 0, and the logistic source term r u μ u 2 was incorporated into ( ) by Heihoff to describe the fierce competition among criminals. Heihoff also proved that the initial-boundary value problem of ( ) possesses a global generalized solution in the two-dimensional setting. The main purpose of this paper is to show that such a generalized solution becomes bounded and smooth at least eventually. In addition, the long-time asymptotic behavior of such a solution is discussed.

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