کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6417217 | 1338551 | 2015 | 49 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Boundedness and global existence in the higher-dimensional parabolic-parabolic chemotaxis system with/without growth source Boundedness and global existence in the higher-dimensional parabolic-parabolic chemotaxis system with/without growth source](/preview/png/6417217.png)
In this paper, we are concerned with a general class of quasilinear parabolic-parabolic chemotaxis systems with/without growth source, under homogeneous Neumann boundary conditions in a smooth bounded domain ΩâRn with nâ¥2. It is recently known that blowup is possible even in the presence of superlinear growth restrictions. Here, we derive new and interesting characterizations on the growth versus the boundedness. We show that the hard task of proving the Lâ-boundedness of the cell density can be reduced to proving its Lr-boundedness. In other words, we show that the Lr-boundedness of the cell density can successfully guarantee its Lâ-boundedness and hence its global boundedness, where r=n+ϵ or n2+ϵ depending on whether the growth restriction is essentially linear (including no growth) or superlinear. Hence, a blowup solution also blows up in Lp-norm for any suitably large p. More detailed information on how the growth source affects the boundedness of the solution is derived. These results reveal deep understandings of blowup mechanism for chemotaxis models. Then we use these criteria to establish uniform boundedness and hence global existence of the underlying models: logistic source in 2-D, cubic source as initially proposed by Mimura and Tsujikawa in 3-D, [(nâ1)+ϵ]st source in n-D with nâ¥4. As a consequence, in a chemotaxis-growth model, blowup is impossible if the growth effect is suitably strong. Finally, we underline that our results remove the commonly assumed convexity on the domain Ω.
Journal: Journal of Differential Equations - Volume 258, Issue 12, 15 June 2015, Pages 4275-4323