arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1802.05064math.PR
收藏

具有局域平均场相互作用的大瓮模型分析

Analysis of Large Urn Models with Local Mean-Field Interactions

Wen Sun, Philippe Robert

摘要:

本文研究的随机模型描述了一组$F_N$相同的球分散到$N$瓮连接的基础对称图与常数度$h_N$的演变。经过一段随机的时间{ \em所有的球}后,任何骨灰盒在其邻域的$h_N$骨灰盒中局部重新分布。球的分配是根据一组取决于系统状态的权重随机进行的。这个上下文的主要原始特征是,相互作用的范围的基数$h_N$不一定是线性的,相对于$N$在一个经典的平均场上下文,而且,由于在同一时间的所有球的重新分配的过程的同时跳转的数量是没有限制的。该方法依赖于与位于给定骨灰盒附近的骨灰盒状态相关联的局部经验分布的演化分析。在适当的条件下,通过选取适当的Wasserstein距离和建立局部经验分布的几个技术估计,我们能够证明平均场收敛结果。当每个节点的负载趋于无穷大,收敛结果的不变分布的相关的McKean-Vlasov过程得到几个分配政策。对于一类权力的$d$的选择政策,我们表明,相关的不变测度有一个渐近有限的支持性质,在此制度下。这一结果与文献中通常遇到的$d$选择策略的幂的经典双指数衰减性质有些不同。

英文摘要:

The stochastic models investigated in this paper describe the evolution of a set of $F_N$ identical balls scattered into $N$ urns connected by an underlying symmetrical graph with constant degree $h_N$. After some random amount of time {\em all the balls} of any urn are redistributed locally, among the $h_N$ urns of its neighborhood. The allocation of balls is done at random according to a set of weights which depend on the state of the system. The main original features of this context is that the cardinality $h_N$ of the range of interaction is not necessarily linear with respect to $N$ as in a classical mean-field context and, also, that the number of simultaneous jumps of the process is not bounded due to the redistribution of all balls of an urn at the same time. The approach relies on the analysis of the evolution of the local empirical distributions associated to the state of urns located in the neighborhood of a given urn. Under convenient conditions, by taking an appropriate Wasserstein distance and by establishing several technical estimates for local empirical distributions, we are able to prove mean-field convergence results. When the load per node goes to infinity, a convergence result for the invariant distribution of the associated McKean-Vlasov process is obtained for several allocation policies. For the class of power of $d$ choices policies, we show that the associated invariant measure has an asymptotic finite support property under this regime. This result differs somewhat from the classical double exponential decay property usually encountered in the literature for power of $d$ choices policies.

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。

↑