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arXiv 1903.03384math-phmath.MP
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平均场Potts模型中相变的精确研究

An exact study of phase transitions in mean field Potts models

Paolo Lorenzoni, Antonio Moro

摘要:

我们构造了完全图上Potts模型的精确配分函数,该图受线性和非线性耦合的外场作用。的配分函数得到的线性扩散方程和自由能的解决方案,在热力学极限,从它的半经典极限。奇异性的状态方程的分析揭示了相变的发生在不为零的外部字段的类型,并允许解释的相变的冲击动力学的热力学变量的空间。该方法在q=3的q状态模型的情况下工作,但该方法推广到任意q。

英文摘要:

We construct the exact partition function of the Potts model on a complete graph subject to external fields with linear and nematic type couplings. The partition function is obtained as a solution to a linear diffusion equation and the free energy, in the thermodynamic limit, follows from its semiclassical limit. Analysis of singularities of the equations of state reveals the occurrence of phase transitions of nematic type at not zero external fields and allows for an interpretation of the phase transitions in terms of shock dynamics in the space of thermodynamics variables. The approach is shown at work in the case of a q-state model for q=3 but the method generalises to arbitrary q.

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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