Universality class of O(N) models.

Universality class of O(N) models.
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O(N) 模型的通用性类别。

DOI:
10.1103/physrevb.54.7177
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发表时间:
1995
期刊:
Physical review. B, Condensed matter
影响因子:
--
通讯作者:
Seiler
Seiler
中科院分区:
--
文献类型:
--
作者:
Patrascioiu;Seiler

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我们指出,现有的关联长度和磁化率的数值数据表明,具有标准作用量的二维$O(3)$模型具有临界指数$\eta=1/4$,这与渐近自由度不一致。这个值也不同于Wess-Zumino-Novikov-Witten模型的值,后者应该对应于$O(3)$模型在$\theta=\pi$。
We point out that existing numerical data on the correlation length and magnetic susceptibility suggest that the two dimensional $O(3)$ model with standard action has critical exponent $\eta=1/4$, which is inconsistent with asymptotic freedom. This value of $\eta$ is also different from the one of the Wess-Zumino-Novikov-Witten model that is supposed to correspond to the $O(3)$ model at $\theta=\pi$.