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arXiv 2110.04531math.PRmath-phmath.MP
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随机场Ising和Potts模型的长程序

Long range order for random field Ising and Potts models

Jian Ding, Zijie Zhuang

摘要:

对Imbrie(1985)和Bricmont-Kupiainen(1988)的经典结果,即三维及三维以上的随机场Ising模型在低温下存在长程有序,并存在弱无序,给出了一个新的简单证明.用同样的方法,我们得到了两个新的结果:(1)证明了低温下随机场Potts模型在3维及3维以上存在弱无序时存在长程有序;(2)得到了低温下随机场Ising模型在2维的关联长度的一个下界(与Ding-Wirth(2020)的上界相匹配).我们的证明是基于Peierls论证的扩展,并引入了Chalker(1983)、Fisher-Fröhlich-Spencer(1984)、Ding-Wirth(2020)和Talagrand的优化测度论(1980年代)(特别是,我们的证明不涉及重整化群论)。

英文摘要:

We present a new and simple proof for the classic results of Imbrie (1985) and Bricmont-Kupiainen (1988) that for the random field Ising model in dimension three and above there is long range order at low temperatures with presence of weak disorder. With the same method, we obtain a couple of new results: (1) we prove that long range order exists for the random field Potts model at low temperatures with presence of weak disorder in dimension three and above; (2) we obtain a lower bound on the correlation length for the random field Ising model at low temperatures in dimension two (which matches the upper bound in Ding-Wirth (2020)). Our proof is based on an extension of the Peierls argument with inputs from Chalker (1983), Fisher-Fröhlich-Spencer (1984), Ding-Wirth (2020) and Talagrand's majorizing measure theory (1980s) (and in particular, our proof does not involve the renormalization group theory).

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