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arXiv 0705.3305math.PR
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老年随机游动的扩散常数和鞅

Diffusion constants and martingales for senile random walks

Wouter Kager

摘要:

利用时变的方法导出了老年随机游动的扩散常数和鞅。我们提供了直接计算的扩散常数随时间变化的步行。或者,这些常数的值可以从与时变游动相关联的鞅中导出。利用逆时变,通过这些鞅得到了老年随机游动的扩散常数。当游动是扩散的,弱收敛到布朗运动可以证明使用鞅泛函极限定理。

英文摘要:

We derive diffusion constants and martingales for senile random walks with the help of a time-change. We provide direct computations of the diffusion constants for the time-changed walks. Alternatively, the values of these constants can be derived from martingales associated with the time-changed walks. Using an inverse time-change, the diffusion constants for senile random walks are then obtained via these martingales. When the walks are diffusive, weak convergence to Brownian motion can be shown using a martingale functional limit theorem.

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