Explicit lower bound of blow-up time in a fully parabolic chemotaxis system with nonlinear cross-diffusion

Explicit lower bound of blow-up time in a fully parabolic chemotaxis system with nonlinear cross-diffusion
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具有非线性交叉扩散的全抛物线趋化系统中爆炸时间的显式下限

DOI:
10.1016/j.jmaa.2015.11.048
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发表时间:
2016-04
影响因子:
1.3
通讯作者:
Stella Vernier Piro
Stella Vernier Piro
中科院分区:
数学3区
文献类型:
--
作者:
Youshan Tao;Stella Vernier Piro

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研究了以原点为中心的单位球B(0)<$R3中具有正常数χ和参数m∈ R的趋化模型{ut = Δ u− χ <$$>(u(u+ 1)m− 1 <$v),x ∈ B(0),t> 0,vt = Δ v− v+ u,x∈ B(0),t> 0,在齐次Neumann边界条件下光滑解的爆破时间的下界.在假设(u(x,0),v(x,0))=(u 0(|X|),v 0(|X|))∈ C 0(B <$1(0))× W1,∞(B1(0)),证明了当m∈[23,2]时,相应初边值问题经典解的爆破时间有一个用χ,<$B1(0)u 0 p和<$B1(0)度量的显式下界|0.0000| 2 q为适当的p> 1和q> 1。这里我们强调了当m< 2 3时整体古典解的存在性和有界性,从而导出了处理爆破解性质的假设m≥ 2 3.然而,由于技术原因,对于m> 2的情况,爆破时间的下限问题仍然是开放的。
This paper detects the lower bounds of blow-up time of smooth solutions for the chemotaxis model {u t= Δ u− χ∇⋅(u (u+ 1) m− 1∇ v), x∈ B 1 (0), t> 0, v t= Δ v− v+ u, x∈ B 1 (0), t> 0, under homogeneous Neumann boundary conditions in a unit ball B 1 (0)⊂ R 3 centered at the origin, with positive constant χ and parameter m∈ R. Under the assumption that (u (x, 0), v (x, 0))=(u 0 (| x|), v 0 (| x|))∈ C 0 (B¯ 1 (0))× W 1,∞(B 1 (0)), it is shown that whenever m∈[2 3, 2], the blow-up time of a classical solution to the corresponding initial–boundary problem has an explicit lower bound measured in terms of χ,∫ B 1 (0) u 0 p and∫ B 1 (0)|∇ v 0| 2 q for appropriate p> 1 and q> 1. Here we underline that the global classical solution exists and is bounded if m< 2 3, which leads to the assumption m≥ 2 3 for addressing the properties of blow-up solutions. However, the question of lower bounds of blow-up time for the case m> 2 remains open due to technical reasons.
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