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arXiv 2104.14798math.AP
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具有尺寸扩散的碎裂方程:适定性和长期行为

The fragmentation equation with size diffusion: Well-posedness and long-term behavior

Philippe Laurençot, Christoph Walker

摘要:

研究了当粒子尺寸在(0,$\infty$)范围内时,考虑粒子尺寸扩散的碎裂方程的动力学性质.相关的线性算子包含三项,可以看作是薛定谔算子的非局部扰动。利用Miyadera扰动论证证明了它是加权$L_1$ -空间上正解析半群的生成元.此外,如果总碎裂率在无穷远处不为零,则存在唯一的具有给定质量的稳态解。进一步假设整体碎裂率发散到无穷大的大尺寸意味着立即紧的半群,它最终稳定在一个指数速率的一维投影携带的信息的质量的初始值。

英文摘要:

The dynamics of the fragmentation equation with size diffusion is investigated when the size ranges in (0, $\infty$). The associated linear operator involves three terms and can be seen as a nonlocal perturbation of a Schr{ö}dinger operator. A Miyadera perturbation argument is used to prove that it is the generator of a positive, analytic semigroup on a weighted $L_1$-space. Moreover, if the overall fragmentation rate does not vanish at infinity, then there is a unique stationary solution with given mass. Assuming further that the overall fragmentation rate diverges to infinity for large sizes implies the immediate compactness of the semigroup and that it eventually stabilizes at an exponential rate to a one-dimensional projection carrying the information of the mass of the initial value.

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