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arXiv 1306.0335cond-mat.stat-mechhep-th
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三维Ising,O(2)和O(4)自旋模型中的累积量

Cumulants in the 3-dimensional Ising, O(2) and O(4) spin models

Xue Pan, Lizhu Chen, X. S. Chen, Yuanfang Wu

摘要:

基于临界点在不同系统中的普适性质,以及QCD相变与三维Ising、$O(2)$和$O(4)$自旋模型属于同一普适类,研究了这三种自旋模型的序参量的累积量和高阶累积量比的临界行为.我们发现,所有较高的累积量比的变化显着的符号附近的临界温度。三种模型的同阶累积量比的定性临界行为是一致的。

英文摘要:

Based on the universal properties of a critical point in different systems and that the QCD phase transitions fall into the same universality classes as the 3-dimensional Ising, $O(2)$ or $O(4)$ spin models, the critical behavior of cumulants and higher cumulant ratios of the order parameter from the three kinds of spin models is studied. We found that all higher cumulant ratios change dramatically the sign near the critical temperature. The qualitative critical behavior of the same order cumulant ratio is consistent in these three models.

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