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arXiv 2302.05500math.DS
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半无限区间上随机非局部时滞反应扩散方程的随机吸引子

Random attractors for a stochastic nonlocal delayed reaction-diffusion equation on a semi-infinite interval

Wenjie Hu, Quanxin Zhu, Tomás Caraballo

摘要:

研究了半无限区间上一类随机非局部时滞反应扩散方程(SNDRDE)在有限端具有Dirichlet边界条件时随机吸引子的存在性和定性性质.该方程模拟了一个两阶段物种的成熟个体的时空演化,该物种的少年和成年人都扩散,生活在一个半无限的域上,并受到随机扰动。通过将SNDRDE转化为一个具有时滞的随机发展方程,利用一个平稳的共轭变换,我们首先建立了该方程解的整体存在唯一性,然后证明了解生成一个随机动力系统.然后,我们推导出解的一致先验估计,并证明了有界随机吸收集的存在性。随后,我们证明了由SNDRDE生成的随机动力系统关于紧开拓扑的拉回渐近紧性,从而得到了随机吸引子的存在性。最后,在适当的条件下,证明了随机吸引子是指数吸引平稳解。

英文摘要:

The aim of this paper is to prove the existence and qualitative property of random attractors for a stochastic nonlocal delayed reaction-diffusion equation (SNDRDE) on a semi-infinite interval with a Dirichlet boundary condition on the finite end. This equation models the spatial-temporal evolution of the mature individuals for a two-stage species whose juvenile and adults both diffuse that lives on a semi-infinite domain and subject to random perturbations. By transforming the SNDRDE into a random evolution equation with delay, by means of a stationary conjugate transformation, we first establish the global existence and uniqueness of solutions to the equation, after which we show the solutions generate a random dynamical system. Then, we deduce uniform a priori estimates of the solutions and show the existence of bounded random absorbing sets. Subsequently, we prove the pullback asymptotic compactness of the random dynamical system generated by the SNDRDE with respect to the compact open topology, and hence obtain the existence of random attractors. At last, it is proved that the random attractor is an exponentially attracting stationary solution under appropriate conditions.

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