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arXiv 1012.5004hep-latcond-mat.stat-mech
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磁场中的自由能和三维伊辛模型的普适标度状态方程

The free energy in a magnetic field and the universal scaling equation of state for the three-dimensional Ising model

P. Butera, M. Pernici

摘要:

我们对传统的三维伊辛模型和一般假定属于同一临界普适类的各种其他自旋系统的自由能的高温和低磁场(以及相关的低温和高磁场)二元展开进行了实质性的推广。特别地,我们还导出了自旋s= 1,3/2,.的伊辛模型的类似展开式.对于具有四次自相互作用的格点欧几里德标量场理论,在简单立方格点和体心立方格点上也是如此。我们的二元高温展开式延伸到K ^[24],使我们能够以相同的阶数计算自由能对场的所有高阶导数,即所有高阶导数。这些数据使更准确的检查可能,在临界条件下,无论是缩放和普适性属性相对于晶格和相互作用结构,也有助于提高一个近似的参数表示的临界状态方程的三维伊辛模型普适类。

英文摘要:

We have substantially extended the high-temperature and low-magnetic-field (and the related low-temperature and high-magnetic-field) bivariate expansions of the free energy for the conventional three-dimensional Ising model and for a variety of other spin systems generally assumed to belong to the same critical universality class. In particular, we have also derived the analogous expansions for the Ising models with spin s=1,3/2,.. and for the lattice euclidean scalar field theory with quartic self-interaction, on the simple cubic and the body-centered cubic lattices. Our bivariate high-temperature expansions, which extend through K^24, enable us to compute, through the same order, all higher derivatives of the free energy with respect to the field, namely all higher susceptibilities. These data make more accurate checks possible, in critical conditions, both of the scaling and the universality properties with respect to the lattice and the interaction structure and also help to improve an approximate parametric representation of the critical equation of state for the three-dimensional Ising model universality class.

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