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arXiv 0809.3467math.PR
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随机环境中随机游动的平均大偏差

Averaged large deviations for random walk in a random environment

Atilla Yilmaz

摘要:

在他2003年的论文中,Varadhan证明了在均匀椭圆i.i.d.中最近邻随机游动的粒子的平均速度的平均大偏差原理。环境下的$\mathbb{Z}^d$与$d\geq1$,并给出了相应速率函数$I_a$的变分公式.在Sznitman的瞬变条件(T)下,我们证明了$I_a$在非空开集$\mathcal{A}$上是严格凸的和解析的,并且粒子的真速度是一个元素(分别为.在边界)的$\mathcal{A}$时,步行是非嵌套(分别)。雏鸟)。然后,我们确定在任何速度的Varadhan的变分公式在$\mathcal{A}$的唯一极小。

英文摘要:

In his 2003 paper, Varadhan proves the averaged large deviation principle for the mean velocity of a particle taking a nearest-neighbor random walk in a uniformly elliptic i.i.d. environment on $\mathbb{Z}^d$ with $d\geq1$, and gives a variational formula for the corresponding rate function $I_a$. Under Sznitman's transience condition (T), we show that $I_a$ is strictly convex and analytic on a non-empty open set $\mathcal{A}$, and that the true velocity of the particle is an element (resp. in the boundary) of $\mathcal{A}$ when the walk is non-nestling (resp. nestling). We then identify the unique minimizer of Varadhan's variational formula at any velocity in $\mathcal{A}$.

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