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arXiv 1202.4205math.PRmath-phmath.GMmath.MP
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Curie-Weiss模型Gibbs-非Gibbs动力学转变的变分描述

Variational description of Gibbs-non-Gibbs dynamical transitions for the Curie-Weiss model

Roberto Fernández, Frank den Hollander, Julián Martínez

摘要:

我们进行了详细的研究吉布斯-非吉布斯转变的居里-外斯模型受到独立的自旋翻转动力学(“无限温度”动力学)。我们表明,在这种设置中,在van Enter,Fernández,den Hollander和Redig中概述的程序可以完全完成,即吉布斯-非吉布斯转变相当于大偏差率函数的全局最小值集合中的分叉,其磁化轨迹以其端点为条件。因此,我们表明,时间演化模型是非吉布斯当且仅当这一套是不是一个单为最终磁化的一些值。详细描述了可能的情况下的分歧,导致一个完整的表征通道从吉布斯到非吉布斯-反之亦然-尖锐的过渡时间(根据动态吉布斯可以丢失,可以恢复)。我们的分析扩展了Ermolaev和Kulske考虑零磁场和有限温度自旋翻转动力学的工作。我们考虑零和非零磁场,但限于无限温度自旋翻转动力学。我们的研究结果揭示了一个有趣的相互作用参数的依赖关系,包括最佳轨迹的禁区的存在和可能发生的过冲和下冲的最佳轨迹。所提供的数值图是在MATHEMATICA的帮助下获得的。

英文摘要:

We perform a detailed study of Gibbs-non-Gibbs transitions for the Curie-Weiss model subject to independent spin-flip dynamics ("infinite-temperature" dynamics). We show that, in this setup, the program outlined in van Enter, Fernández, den Hollander and Redig can be fully completed, namely that Gibbs-non-Gibbs transitions are equivalent to bifurcations in the set of global minima of the large-deviation rate function for the trajectories of the magnetization conditioned on their endpoint. As a consequence, we show that the time-evolved model is non-Gibbs if and only if this set is not a singleton for some value of the final magnetization. A detailed description of the possible scenarios of bifurcation is given, leading to a full characterization of passages from Gibbs to non-Gibbs -and vice versa- with sharp transition times (under the dynamics Gibbsianness can be lost and can be recovered). Our analysis expands the work of Ermolaev and Kulske who considered zero magnetic field and finite-temperature spin-flip dynamics. We consider both zero and non-zero magnetic field but restricted to infinite-temperature spin-flip dynamics. Our results reveal an interesting dependence on the interaction parameters, including the presence of forbidden regions for the optimal trajectories and the possible occurrence of overshoots and undershoots in the optimal trajectories. The numerical plots provided are obtained with the help of MATHEMATICA.

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