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arXiv 1008.0913math.PRmath.DS
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群上带平稳噪声的随机差分方程

A stochastic difference equation with stationary noise on groups

C. R. E. Raja

摘要:

考虑局部紧群$G$上的随机差分方程$$η_k = ξ_k ϕ(η_{k-1}), ~~~~ k \in \Z $$,其中$ξ_k$是给定的$G$值随机变量,$η_k$是未知的$G$值随机变量,$ϕ$是$G$的自同构. Tsirelson和Yor在一维环面上考虑了这个方程。我们考虑了当$ξ_k$有共同律$μ$时的情形,证明了如果$G$是逐点远群,$ϕ$是$G$的远自同构,并且如果方程有解,则方程的极值解在一个-与陪集空间$K\backslash G$上的点的一个对应,对于$G$的某个紧致子群$K$,使得对于$z$中的任何$z$,$μ$在$Kz= zϕ(K)$上都是支持的。支持$μ$。我们还提供了方程解存在的一个充分必要条件。

英文摘要:

We consider the stochastic difference equation $$η_k = ξ_k ϕ(η_{k-1}), ~~~~ k \in \Z $$ on a locally compact group $G$ where $ξ_k$ are given $G$-valued random variables, $η_k$ are unknown $G$-valued random variables and $ϕ$ is an automorphism of $G$. This equation was considered by Tsirelson and Yor on one-dimensional torus. We consider the case when $ξ_k$ have a common law $μ$ and prove that if $G$ is a pointwise distal group and $ϕ$ is a distal automorphism of $G$ and if the equation has a solution, then extremal solutions of the equation are in one-one correspondence with points on the coset space $K\backslash G$ for some compact subgroup $K$ of $G$ such that $μ$ is supported on $Kz= zϕ(K)$ for any $z$ in the support of $μ$. We also provide a necessary and sufficient condition for the existence of solutions to the equation.

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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