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arXiv 2201.05794math.AP
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具有非局部扩散的非自治 Fisher-KPP 方程的传播性质

Spreading properties for non-autonomous Fisher-KPP equations with nonlocal diffusion

Arnaud Ducrot, Zhucheng Jin

AI总结:

本文研究了由细尾核驱动的具有非局部扩散的非自治 Fisher-KPP 方程的传播速度,针对紧支撑和指数衰减初始数据,在一般时间异质性下给出了用最小均值表示的上下界估计,并在更强假设下证明了确定传播速度,通过精细分析克服了非局部扩散解缺乏正则性的困难。

摘要:

我们研究了由细尾核驱动的具有非局部扩散的非自治 Fisher-KPP 方程解的渐近传播速度。本文关注紧支撑初始数据和指数衰减初始数据。对于一般的时间异质性,我们提供了解传播速度的下界和上界估计,该速度用问题中时变系数的最小均值表示。在这些系数更强的关于时间平均的假设下,我们证明这些解以确定的确定速度传播。在此分析中,一个重要的困难来自于非局部扩散引起的解缺乏正则性。通过精细的分析,我们针对配备合适初始数据的逻辑斯谛方程的某些解,导出了一些正则性估计(关于大时间的均匀连续性类型)。这些结果随后被用于处理更一般的非线性问题,并导出了相当一般的传播速度结果。

英文摘要:

We investigate the asymptotic speed of spread of the solutions of a non-autonomous Fisher-KPP equation with nonlocal diffusion, driven by a thin-tailed kernel. In this paper, we are concerned with both compactly supported and exponentially decaying initial data. For general time heterogeneity, we provide lower and upper estimates of the spreading speed of the solutions, which is expressed in term of the least mean of the time varying coefficients of the problem. Under some stronger time averaging assumptions for these coefficients, we prove that these solutions propagate with some determined speed. In this analysis, an important difficulty comes from the lake of regularization for the solutions arising with nonlocal diffusion. Through delicate analysis we derive some regularity estimates (of uniform continuity type for the large time) for some solutions of the logistic equation equipped with suitable initial data. These results are then used to handle more general nonlinearities and derive a rather general spreading speed results.

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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