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arXiv 2207.08293math.APmath.PR
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反应-扩散方程组中输运噪声导致的爆破延迟与扩散增强

Delayed blow-up and enhanced diffusion by transport noise for systems of reaction-diffusion equations

Antonio Agresti

AI总结:

本文研究带质量控制的反应-扩散方程组,证明适当乘性输运噪声可延迟强解爆破并增强扩散,在质量指数衰减时得到全局存在性。

摘要:

本文研究具有质量控制的一类反应-扩散方程组在噪声正则化方面的问题。已知此类偏微分方程组的强解可能在有限时间内发生爆破。此外,对于许多具有实际意义的系统,判断爆破是否发生仍是一个悬而未决的问题。本文证明了一类适当的乘性输运型噪声具有正则化效应。更确切地说,当噪声强度和谱足够大时,强解的爆破会被延迟,并且还能建立增强的扩散效应。对于质量指数衰减的情形,证明了全局存在性。证明过程结合并推广了噪声正则化领域以及随机偏微分方程 $L^p(L^q)$ 方法的最新进展,揭示出这两个领域之间的新联系。

英文摘要:

This paper is concerned with the problem of regularization by noise of systems of reaction-diffusion equations with mass control. It is known that $\textit{strong}$ solutions to such systems of PDEs may blow-up in finite time. Moreover, for many systems of practical interest, establishing whether the blow-up occurs or not is an open question. Here we prove that a suitable multiplicative noise of transport type has a regularizing effect. More precisely, for sufficiently noise intensity and spectrum, the blow-up of strong solutions is delayed and an enhanced diffusion effect is also established. Global existence is shown for the case of exponentially decreasing mass. The proofs combine and extend recent developments in regularization by noise and in the $L^p(L^q)$-approach to stochastic PDEs, highlighting new connections between the two areas.

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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