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arXiv 2004.00529math.AP
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一类完全交叉扩散的捕食-食饵系统的存在性理论与定性分析

Existence theory and qualitative analysis for a fully cross-diffusive predator-prey system

Youshan Tao, Michael Winkler

摘要:

本文考虑了捕食-被捕食系统$$ \left\{ \begin{array}{l} u_t = D_1 u_{xx} - χ_1 (uv_x)_x + u(λ_1-u+a_1 v), \\[1mm] v_t = D_2 v_{xx} + χ_2 (vu_x)_x + v(λ_2-v-a_2 u), \end{array} \right. \qquad \qquad (\star) $$在空间区域上的Neumann初边值问题,其中$i\in\{1,2\}$的参数$D_i, a_i, λ_i$和$χ_i$为正.由于同时出现的两个相互作用的出租车型交叉扩散机制,其中一个甚至是有吸引力的,似乎不清楚多远的解决方案理论可以建立在经典的结果上的抛物演化问题。然而,为了创建一个分析设置能够提供全球存在的结果,以及定性行为的详细信息,这项工作追求的战略,通过抛物正则化,在此过程中($\star$)是近似的某些四阶问题,涉及退化扩散算子的薄膜类型。在其设计过程中,一个主要的挑战是有关的野心,以保持一致性与一些基本的熵的结构形式上与($\star$);特别是,这将促使建设一个近似方案,包括两个自由参数,这将最终以不同的方式固定,这取决于$λ_2$的大小相对于$a_2 λ_1$。

英文摘要:

This manuscript considers a Neumann initial-boundary value problem for the predator-prey system $$ \left\{ \begin{array}{l} u_t = D_1 u_{xx} - χ_1 (uv_x)_x + u(λ_1-u+a_1 v), \\[1mm] v_t = D_2 v_{xx} + χ_2 (vu_x)_x + v(λ_2-v-a_2 u), \end{array} \right. \qquad \qquad (\star) $$ in an open bounded interval $Ω$ as the spatial domain, where for $i\in\{1,2\}$ the parameters $D_i, a_i, λ_i$ and $χ_i$ are positive. Due to the simultaneous appearance of two mutually interacting taxis-type cross-diffusive mechanisms, one of which even being attractive, it seems unclear how far a solution theory can be built upon classical results on parabolic evolution problems. In order to nevertheless create an analytical setup capable of providing global existence results as well as detailed information on qualitative behavior, this work pursues a strategy via parabolic regularization, in the course of which ($\star$) is approximated by means of certain fourth-order problems involving degenerate diffusion operators of thin film type. During the design thereof, a major challenge is related to the ambition to retain consistency with some fundamental entropy-like structures formally associated with ($\star$); in particular, this will motivate the construction of an approximation scheme including two free parameters which will finally be fixed in different ways, depending on the size of $λ_2$ relative to $a_2 λ_1$.

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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