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Moment bounds of a class of stochastic heat equations driven by space–time colored noise in bounded domains

机译:一类随机热方程的时刻界限,在有界域中的时空彩色噪声驱动

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摘要

We consider the fractional stochastic heat type equation egin{align*}partial_t u_t(x)=-(-Delta)^{lpha/2}u_t(x)+xisigma(u_t(x))dot{F}(t,x), xin D, t>0, end{align*} with nonnegative bounded initial condition,where $lphain (0,2]$, $xi>0$ is the noise level,$sigma:mathbb{R}ightarrowmathbb{R}$ is a globally Lipschitz functionsatisfying some growth conditions and the noise term behave in space like theRiez kernel and is possibly correlated in time and $D$ is the open ball ofradius $R>0$, centered at the origin. When the noise term is not correlated intime, we establish a change in the growth of the solution of these equationsdepending on the noise level $xi$. On the other hand when the noise termbehaves in time like the fractional Brownian motion with index $Hin (1/2,1)$,We also derive explicit bounds leading to a well-known weakly$ho$-intermittency property.
机译:我们考虑分数随机热型方程开始{align *} partial_t u_t(x)= - ( - delta)^ { alpha / 2} u_t(x)+ xi sigma(u_t(x)) dot {f}(t,x), x 中的d, t> 0, end {align *}与非负界初始条件,其中$ alpha in(0,2] $,$ xi> 0 $是噪音水平,$ sigma: mathbb {r} lightarrow mathbb {r} $是一个全球Lipschitz函数,函数为某些增长条件和噪音术语在诸如Theriez内核的空间中表现出来,并且可能相关时间和$ D $是Radius $ r> 0 $的打开球,以原点为中心。当噪音术语没有相关的噪声,我们在噪声水平$ xi上建立这些方程式的增长的变化另一方面,当噪声终结时的时间与索引$ H IN(1 / 2,1)$的分数朗米动作,我们也会导致明确的界限,导致一个众所周知的弱 rho $ -intentency财产。

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