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arXiv 1605.05072cond-mat.dis-nn
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无序系统中的相变:四维中随机场伊辛模型的例子

Phase transitions in disordered systems: the example of the random-field Ising model in four dimensions

Nikolaos G. Fytas, Victor Martin-Mayor, Marco Picco, Nicolas Sourlas

摘要:

通过在零温度下对不同形状的随机场分布的$D=4$随机场伊辛模型进行高统计模拟,我们表明该模型是由一个单一的普适类。我们计算到一个高精度的完整的临界指数为这个类,包括校正标度指数。我们的结果表明,在四维:(i)的微扰重整化群预测的降维不成立,(ii)需要三个独立的临界指数来描述的过渡。

英文摘要:

By performing a high-statistics simulation of the $D=4$ random-field Ising model at zero temperature for different shapes of the random-field distribution, we show that the model is ruled by a single universality class. We compute to a high accuracy the complete set of critical exponents for this class, including the correction-to-scaling exponent. Our results indicate that in four dimensions: (i) dimensional reduction as predicted by the perturbative renormalization group does not hold and (ii) three independent critical exponents are needed to described the transition.

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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