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Finite-time blow-up and global boundedness for chemotaxis system with strong logistic dampening
Journal of Mathematical Analysis and Applications ( IF 1.3 ) Pub Date : 2020-01-14 , DOI: 10.1016/j.jmaa.2020.123876
Xinyu Tu , Shuyan Qiu

In the present study, we consider the chemotaxis system with logistic-type superlinear degradation{tu1=τ1Δu1χ1(u1v)+λ1u1μ1u1k1,xΩ,t>0,tu2=τ2Δu2χ2(u2v)+λ2u2μ2u2k2,xΩ,t>0,0=Δvγv+α1u1+α2u2,xΩ,t>0, under the homogeneous Neumann boundary condition, where γ>0, τi>0, χi>0, λiR, μi>0, αi>0 (i=1,2). Consider an arbitrary ball Ω=BR(0)Rn,n3,R>0, when ki>1(i=1,2), it is shown that for any parameter kˆ=max{k1,k2} satisfieskˆ<{76ifn{3,4},1+12(n1)ifn5, there exist nonnegative radially symmetric initial data under suitable conditions such that the corresponding solutions blow up in finite time in the sense thatlim suptTmax(u1(,t)L(Ω)+u2(,t)L(Ω))=for some0<Tmax<. Furthermore, for any smooth bounded domain ΩRn(n1), when ki2(i=1,2), we prove that the system admits a unique global bounded solution.



中文翻译:

具有强大逻辑阻尼的趋化系统的有限时间爆破和全局有界性

在本研究中,我们考虑具有logistic型超线性退化的趋化系统{Ťü1个=τ1个Δü1个-χ1个ü1个v+λ1个ü1个-μ1个ü1个ķ1个XΩŤ>0Ťü2=τ2Δü2-χ2ü2v+λ2ü2-μ2ü2ķ2XΩŤ>00=Δv-γv+α1个ü1个+α2ü2XΩŤ>0 在齐次Neumann边界条件下, γ>0τ一世>0χ一世>0λ一世[Rμ一世>0α一世>0 一世=1个2。考虑一个任意球Ω=[R0[Rññ3[R>0, 什么时候 ķ一世>1个一世=1个2,表明对于任何参数 ķˆ=最高{ķ1个ķ2} 满足ķˆ<{76如果ñ{34}1个+1个2ñ-1个如果ñ5 在适当的条件下存在非负的径向对称初始数据,使得相应的解在有限的时间内爆炸,lim supŤŤ一种Xü1个Ť大号Ω+ü2Ť大号Ω=对于一些0<Ť一种X< 此外,对于任何光滑有界域 Ω[Rññ1个, 什么时候 ķ一世2一世=1个2,我们证明系统接受了唯一的全局有界解决方案。

更新日期:2020-01-14
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