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arXiv 1708.01546math.PR
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随机耦合微分方程系统的幂律衰减

Power law decay for systems of randomly coupled differential equations

Laszlo Erdos, Torben Krüger, David Renfrew

摘要:

我们考虑大型随机矩阵$X$的中心,独立的项目,但可能不同的方差。对于在$X$谱上解析的$f,g$函数,我们计算了$f(X) g(X^*)$的归一化迹.我们利用这些结果计算了具有随机系数的耦合微分方程系统的长时间渐近性。我们表明,当耦合是关键的解决方案的平方范数像$t^{-1/2}$衰减。

英文摘要:

We consider large random matrices $X$ with centered, independent entries but possibly different variances. We compute the normalized trace of $f(X) g(X^*)$ for $f,g$ functions analytic on the spectrum of $X$. We use these results to compute the long time asymptotics for systems of coupled differential equations with random coefficients. We show that when the coupling is critical the norm squared of the solution decays like $t^{-1/2}$.

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