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arXiv 1602.07262math.PRmath-phmath.APmath.MP
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$(d+1)$维分数阶时空随机偏微分方程的阵发阵面

Intermittency fronts for space-time fractional stochastic partial differential equations in $(d+1)$ dimensions

Sunday A. Asogwa, Erkan Nane

摘要:

考虑时间分数阶随机热型方程$$\partial^β_tu_t(x)=-ν(-Δ)^{α/2} u_t(x)+I^{1-β}_t[σ(u)\stackrel{\cdot}{W}(t,x)]$$在$(d+1)$维上的情形,其中$ν>0$,$β\in (0,1)$,$α\in (0,2]$,$d<\min\{2,β^{-1}\}\a$,$\partial^β_t$是Caputo分数阶导数,$-(-Δ)^{α/2} $是各向同性稳定过程的生成元,$\stackrel{\cdot}{W}(t,x)$是时空白噪声,$σ:\R \to\RR{R}$是Lipschitz连续的. Mijena和Nane在\cite{JebesaAndNane1}中证明了:(1)这个方程的解的绝对矩呈指数增长;(2)这些矩的最高峰到原点的距离随时间呈线性增长。最后一个结果在$α=2$和$d=1.$的假设下得到了证明。本文将这个结果推广到$α=2$和$d\in\{1,2,3\}.$的情形。

英文摘要:

We consider time fractional stochastic heat type equation $$\partial^β_tu_t(x)=-ν(-Δ)^{α/2} u_t(x)+I^{1-β}_t[σ(u)\stackrel{\cdot}{W}(t,x)]$$ in $(d+1)$ dimensions, where $ν>0$, $β\in (0,1)$, $α\in (0,2]$, $d<\min\{2,β^{-1}\}\a$, $\partial^β_t$ is the Caputo fractional derivative, $-(-Δ)^{α/2} $ is the generator of an isotropic stable process, $\stackrel{\cdot}{W}(t,x)$ is space-time white noise, and $σ:\R \to\RR{R}$ is Lipschitz continuous. Mijena and Nane proved in \cite{JebesaAndNane1} that : (i) absolute moments of the solutions of this equation grows exponentially; and (ii) the distances to the origin of the farthest high peaks of those moments grow exactly linearly with time. The last result was proved under the assumptions $α=2$ and $d=1.$ In this paper we extend this result to the case $α=2$ and $d\in\{1,2,3\}.$

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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