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arXiv 1707.02668math.PRmath-phmath.MP
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平面Ising模型近临界标度极限的指数衰减

Exponential decay for the near-critical scaling limit of the planar Ising model

Federico Camia, Jianping Jiang, Charles M. Newman

摘要:

我们考虑了在临界温度下,外磁场$ha^{15/8}$作用在晶格间距为$a$的正方形晶格上的伊辛模型.我们证明了该模型中的截断两点函数以与$a$无关的速率指数衰减。因此,我们在近临界标度极限的欧几里得磁化场指数衰减。对于具有$a=1$的晶格模型,质量(逆相关长度)的阶数为$h^{8/15}$和$h\downarrow 0$ ;对于欧几里得场,对于某些$C$,它正好等于$Ch^{8/15}$。虽然临界尺度极限的研究已经取得了很大的进展,但近临界模型的结果还远远不够,这是因为远离临界点时缺乏共形不变性。我们的论点结合晶格和连续FK表示,包括耦合共形循环和措施合奏,表明这样的合奏可以是有用的,即使在近临界标度限制的研究。因此,我们提供了第一个实质性的应用措施合奏。

英文摘要:

We consider the Ising model at its critical temperature with external magnetic field $ha^{15/8}$ on the square lattice with lattice spacing $a$. We show that the truncated two-point function in this model decays exponentially with a rate independent of $a$. As a consequence, we show exponential decay in the near-critical scaling limit Euclidean magnetization field. For the lattice model with $a=1$, the mass (inverse correlation length) is of order $h^{8/15}$ as $h\downarrow 0$; for the Euclidean field, it equals exactly $Ch^{8/15}$ for some $C$. Although there has been much progress in the study of critical scaling limits, results on near-critical models are far fewer due to the lack of conformal invariance away from the critical point. Our arguments combine lattice and continuum FK representations, including coupled conformal loop and measure ensembles, showing that such ensembles can be useful even in the study of near-critical scaling limits. Thus we provide the first substantial application of measure ensembles.

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