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arXiv 1206.0895math.PR
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随机场Curie-Weiss模型的中偏差

Moderate deviations for random field Curie-Weiss models

Matthias Löwe, Raphael Meiners

摘要:

随机场Curie-Weiss模型是在经典Curie-Weiss模型的基础上,用随机局部磁场代替确定性全局磁场而得到的。这开辟了一个新的和有趣的丰富的相结构。在这种情况下,我们推导出中等偏差原则的随机总磁化$S_n$,这是(依赖)自旋的部分和。一个典型的结果是,在适当的假设下的分布的本地外部场存在一个实数$m$,一个正实数$λ$,和一个正整数$k$,使得$(S_n-nm)/n^α$满足一个中等偏差原则与速度$n^{1-2k(1-α)}$和速率函数$λx^{2k}/(2k)!$,其中$1-1/(2(2k-1)) < α< 1$。

英文摘要:

The random field Curie-Weiss model is derived from the classical Curie-Weiss model by replacing the deterministic global magnetic field by random local magnetic fields. This opens up a new and interestingly rich phase structure. In this setting, we derive moderate deviations principles for the random total magnetization $S_n$, which is the partial sum of (dependent) spins. A typical result is that under appropriate assumptions on the distribution of the local external fields there exist a real number $m$, a positive real number $λ$, and a positive integer $k$ such that $(S_n-nm)/n^α$ satisfies a moderate deviations principle with speed $n^{1-2k(1-α)}$ and rate function $λx^{2k}/(2k)!$, where $1-1/(2(2k-1)) < α< 1$.

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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