Global boundedness and large time behaviour in a higher-dimensional quasilinear chemotaxis system with consumption of chemoattractant

This paper deals with the following quasilinear chemotaxis system with consumption of chemoattractant \ \array{@{ll} uₜ= u^m- (u v), & x, t>0, \\ vₜ= v-uv, & x, t>0\\ array. \ in a bounded domain RN (N=3, \, 4, \, 5) with smooth boundary. It is shown that if m> \1, \, {3N-22N+2\}, for any reasonably smooth nonnegative initial data, the corresponding no-flux type initial-boundary value problem possesses a globally bounded weak solution. Furthermore, we prove that the solution converges to the spatially homogeneous equilibrium (u₀, \, 0) in an appropriate sense as t, where u₀= 1| | _ u₀. This result not only partly extends the previous global boundedness result in Fan and Jin (J. Math. Phys. 58 (2017), 011503) and Wang and Xiang (Z. Angew. Math. Phys. 66 (2015), 3159–3179) to m> 3N-22N in the case N 3, but also partly improves the global existence result in Zheng and Wang (Discrete Contin. Dyn. Syst. Ser. B 22 (2017), 669–686) to m> 3N2N+2 when N 2.