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Positive specific-heat critical exponent of a three-dimensional three-state random-bond Potts model

机译:三维三态随机键Potts模型的正比热临界指数

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摘要

Whereas the stability of a pure critical system is determined by the sign of its specific-heat critical exponent α according to Harris criterion, whether a d-dimensional dirty system should satisfy ν≥2/d and α<0 or not has been a controversial issue for several decades, where ν is its correlation-length critical exponent. Here, contrary to recent analytical and numerical results, we find for the three-dimensional three-state random-bond Potts model whose pure version exhibits a first-order phase transition a random fixed point whose ν<2/d and α>0 using a finite-time scaling combining with extended dynamic Monte Carlo renormalization-group method. This suggests further studies are still needed to clarify the issue in three-dimensional systems.
机译:纯粹的临界系统的稳定性由根据哈里斯准则的比热临界指数α的符号来确定,而d维脏系统是否应满足ν≥2/ d和α<0一直是一个有争议的问题几十年来的问题,其中ν是相关长度的临界指数。在这里,与最近的分析和数值结果相反,我们发现对于三维纯状态具有一阶相变的三维三态随机键Potts模型,其随机固定点的ν<2 / d和α> 0有限时间缩放与扩展动态蒙特卡洛重归一化组方法相结合。这表明仍然需要进一步的研究来阐明三维系统中的问题。

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