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arXiv 1809.09240math-phcond-mat.stat-mechmath.MP
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二维伊辛模型对角尺度函数的导修正

Leading corrections to the scaling function on the diagonal for the two-dimensional Ising model

P. J. Forrester, J. H. H. Perk, A. K. Trinh, N. S. Witte

摘要:

在临界点附近,二维伊辛模型的自旋-自旋关联函数的关联长度发散。关联函数允许缩放极限,其中自旋之间的间隔$N$变为无穷大,但缩放变量$s = N(1-t)/2$保持固定,其中$t$是耦合,而$t=1$是临界点。以前的工作已经指定了这些标度函数(有一个从上面接近的临界点,另一个如果从下面接近)的超越定义的一个特定的$σ$ -形式的退化Painlevé V方程。对于对角-对角相关,我们将前两个领先的大$N$校正项的尺度函数-这些发生在订单$N^{-1}$和$N^{-2}$ -在一个二阶线性微分方程的解决方案与这些超越的系数,并显示如何可以计算。我们表明,顺序$N^{-1}$是平凡的,可以通过适当的变量消除,使领先的非平凡的校正顺序$N^{-2}$。在这方面,我们的研究结果给出了准确和充分的特点,在早期的文献中提出的要求。

英文摘要:

In the neighbourhood of the critical point, the correlation length of the spin-spin correlation function of the two-dimensional Ising model diverges. The correlation function permits a scaling limit in which the separation $N$ between spins goes to infinity, but the scaling variable $s = N(1-t)/2$ remains fixed, where $t$ is the coupling, and $t=1$ the critical point. Previous work has specified these scaling functions (there is one for the critical point being approached from above, and another if approached from below) in terms of transcendents defined by a particular $σ$-form of the degenerate Painlevé V equation. For the diagonal-diagonal correlation, we characterise the first two leading large $N$ correction terms to the scaling functions --- these occur at orders $N^{-1}$ and $N^{-2}$ --- in terms of solutions of a second order linear differential equation with coefficients given in terms of these transcendents, and show how they can be computed. We show that the order $N^{-1}$ is trivial and can be eliminated through appropriate variables so that the leading non-trivial correction is of order $N^{-2}$. In this respect our result gives precise and full characterisation of claims made in the earlier literature.

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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