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arXiv 1001.0895math.PR
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马尔可夫链在流动极限中对快速变量的平均:在有记忆超市模型中的应用

Averaging over fast variables in the fluid limit for Markov chains: Application to the supermarket model with memory

M. J. Luczak, J. R. Norris

摘要:

我们提出了一个一般的程序,允许某些马尔可夫链的微分方程的解决方案的近似。考虑的链有一些组件的快速和随机振荡,而其他的是接近确定性。极限动力学是通过对后者相对于前者的局部平衡分布的漂移求平均而获得的。在快变量的一致混合条件下证明了一些一般性估计,这些估计给出了流体近似的显式误差概率。Mitzenmacher,Prabhakar and Shah [In Proc. 43rd Ann. Symp.发现. Comp. Sci.(2002)799-808,IEEE]引入了“加入最短队列”或“超市”模型的具有记忆的变体,并且获得了队列数量和总到达率都很大的稳定系统的情况下的极限图。在此极限下,队列量的经验分布满足一个微分方程,而系统的记忆则快速随机振荡。我们说明了我们的一般流体极限估计给出了这个极限图片的证明。

英文摘要:

We set out a general procedure which allows the approximation of certain Markov chains by the solutions of differential equations. The chains considered have some components which oscillate rapidly and randomly, while others are close to deterministic. The limiting dynamics are obtained by averaging the drift of the latter with respect to a local equilibrium distribution of the former. Some general estimates are proved under a uniform mixing condition on the fast variable which give explicit error probabilities for the fluid approximation. Mitzenmacher, Prabhakar and Shah [In Proc. 43rd Ann. Symp. Found. Comp. Sci. (2002) 799-808, IEEE] introduced a variant with memory of the "join the shortest queue" or "supermarket" model, and obtained a limit picture for the case of a stable system in which the number of queues and the total arrival rate are large. In this limit, the empirical distribution of queue sizes satisfies a differential equation, while the memory of the system oscillates rapidly and randomly. We illustrate our general fluid limit estimate by giving a proof of this limit picture.

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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