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arXiv 2103.02246math.AP
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一类具有非线性扩散和依赖于信号的灵敏度的完全抛物吸引-排斥趋化系统的有界性

Boundedness in a fully parabolic attraction-repulsion chemotaxis system with nonlinear diffusion and signal-dependent sensitivity

Yutaro Chiyo, Tomomi Yokota

摘要:

研究了拟线性全抛物型吸引-排斥趋化系统\begin{align*} u_t=\nabla \cdot (D(u)\nabla u) -\nabla \cdot (G(u)χ(v)\nabla v) +\nabla\cdot(H(u)ξ(w)\nabla w), \quad v_t=d_1Δv+αu-βv, \quad w_t=d_2Δw+γu-δw, \quad x \in Ω,\ t>0, \end{align*}在齐次Neumann边界条件和初始条件下的动力学行为,其中$Ω\subset \mathbb{R}^n$ $(n \ge 1)$是具有光滑边界的有界区域,$d_1, d_2, α, β, γ, δ>0$是常数.此外,扩散率$D$、密度依赖性灵敏度$G, H$满足$a_0>0$和$m \in \mathbb{R}$的$D(s)=a_0(s+1)^{m-1}$; $b_0>0$和$q<\min\{2,\ m+1\}$的$0 \le G(s) \le b_0(s+1)^{q-1}$; $c_0>0$和$r<\min\{2,\ m+1\}$的$0 \le H(s) \le c_0(s+1)^{r-1}$,以及$χ, ξ$满足$χ_0>0$和$k_1>1$的$0<χ(s)\le \frac{χ_0}{s^{k_1}}$; $ξ_0>0$和$k_2>1$的$0<ξ(s)\le \frac{ξ_0}{s^{k_2}}$。Ding(J. Math. Anal.应用; 2018;461;1260-1270)和Jia-Yang(J. Math. Anal.应用; 2019;475;139-153)。然而,对于上述具有非线性扩散和依赖于信号的灵敏度的完全抛物吸引-排斥趋化系统,目前还没有相关的研究工作。本文通过引入一个新的检验函数,证明了该系统古典解的整体存在性和有界性。

英文摘要:

This paper deals with the quasilinear fully parabolic attraction-repulsion chemotaxis system \begin{align*} u_t=\nabla \cdot (D(u)\nabla u) -\nabla \cdot (G(u)χ(v)\nabla v) +\nabla\cdot(H(u)ξ(w)\nabla w), \quad v_t=d_1Δv+αu-βv, \quad w_t=d_2Δw+γu-δw, \quad x \in Ω,\ t>0, \end{align*} under homogeneous Neumann boundary conditions and initial conditions, where $Ω\subset \mathbb{R}^n$ $(n \ge 1)$ is a bounded domain with smooth boundary, $d_1, d_2, α, β, γ, δ>0$ are constants. Also, the diffusivity $D$, the density-dependent sensitivities $G, H$ fulfill $D(s)=a_0(s+1)^{m-1}$ with $a_0>0$ and $m \in \mathbb{R}$; $0 \le G(s) \le b_0(s+1)^{q-1}$ with $b_0>0$ and $q<\min\{2,\ m+1\}$; $0 \le H(s) \le c_0(s+1)^{r-1}$ with $c_0>0$ and $r<\min\{2,\ m+1\}$, and the signal-dependent sensitivities $χ, ξ$ satisfy $0<χ(s)\le \frac{χ_0}{s^{k_1}}$ with $χ_0>0$ and $k_1>1$; $0<ξ(s)\le \frac{ξ_0}{s^{k_2}}$ with $ξ_0>0$ and $k_2>1$. Global existence and boundedness in the case that $w=0$ were proved by Ding (J. Math. Anal. Appl.; 2018;461;1260-1270) and Jia-Yang (J. Math. Anal. Appl.; 2019;475;139-153). However, there is no work on the above fully parabolic attraction-repulsion chemotaxis system with nonlinear diffusion and signal-dependent sensitivity. This paper develops global existence and boundedness of classical solutions to the above system by introducing a new test function.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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