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arXiv 0802.1839cond-mat.stat-mechcond-mat.soft
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临界点附近非高斯涨落的实验证据

Experimental evidence of non-Gaussian fluctuations near a critical point

Sylvain Joubaud, Artem Petrosyan, Sergio Ciliberto, Nicolas Garnier

摘要:

用灵敏的偏振干涉仪测量了液晶指向矢的取向涨落,测量结果接近于由电场驱动的二阶Fréedericksz跃迁。我们发现,在临界值附近的领域的空间平均的序参量有一个广义Gumbel分布,而不是高斯分布。后者在远离临界点处恢复。慢模式的相关性指出。广义Gumbel参数与有效自由度有关。

英文摘要:

The orientation fluctuations of the director of a liquid crystal are measured, by a sensitive polarization interferometer, close to the Fréedericksz transition, which is a second order transition driven by an electric field. We show that near the critical value of the field the spatially averaged order parameter has a generalized Gumbel distribution instead of a Gaussian one. The latter is recovered away from the critical point. The relevance of slow modes is pointed out. The parameter of generalized Gumbel is related to the effective number of degrees of freedom.

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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