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arXiv 1910.09271math.PR
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随机Heat Equation的分数阶矩

Fractional moments of the Stochastic Heat Equation

Sayan Das, Li-Cheng Tsai

摘要:

考虑一维随机热方程的解$\mathcal{Z}(t,x)$,带有乘性时空白噪声和δ初始数据$\mathcal{Z}(0,x) = δ(x)$。对于任意$p>0$,我们得到了$e^{t/12}\mathcal{Z}(2t,0)$的$p$阶矩的详细估计为$t\to\infty$,并由此建立了Kardar-Parisi-Zhang方程的单点上尾大偏差原理.偏差具有速度$t$和速率函数$Φ_+(y)=\frac{4}{3}y^{3/2}$。我们的结果证实了现有的物理预测[Le Doussal,Majumdar,Schehr 16]和[Kamenev,Meerson,Sasorov 16]。

英文摘要:

Consider the solution $\mathcal{Z}(t,x)$ of the one-dimensional stochastic heat equation, with a multiplicative spacetime white noise, and with the delta initial data $\mathcal{Z}(0,x) = δ(x)$. For any real $p>0$, we obtained detailed estimates of the $p$-th moment of $e^{t/12}\mathcal{Z}(2t,0)$, as $t\to\infty$, and from these estimates establish the one-point upper-tail large deviation principle of the Kardar-Parisi-Zhang equation. The deviations have speed $t$ and rate function $Φ_+(y)=\frac{4}{3}y^{3/2}$. Our result confirms the existing physics predictions [Le Doussal, Majumdar, Schehr 16] and also [Kamenev, Meerson, Sasorov 16].

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