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arXiv 0907.5094cond-mat.stat-mechhep-th
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Ashkin-Teller模型中的临界畴壁

Critical domain walls in the Ashkin-Teller model

M. Caselle, S. Lottini, M. A. Rajabpour

摘要:

研究了二维Ashkin-Teller模型中界面的分形性质。在Ising模型和四态Potts模型之间的区间内,沿模型的临界线计算了对称界面的分形维数。利用Schramm的交叉概率公式,我们证明了除了Ising点外,这种界面不能与简单的SLE $_κ$相关.在四态Potts模型中对非对称界面进行了同样的计算:分形维数与Schramm公式的结果是一致的,我们期望在这种情况下得到一个简单的SLE $_κ$。

英文摘要:

We study the fractal properties of interfaces in the 2d Ashkin-Teller model. The fractal dimension of the symmetric interfaces is calculated along the critical line of the model in the interval between the Ising and the four-states Potts models. Using Schramm's formula for crossing probabilities we show that such interfaces can not be related to the simple SLE$_κ$, except for the Ising point. The same calculation on non-symmetric interfaces is performed at the four-states Potts model: the fractal dimension is compatible with the result coming from Schramm's formula, and we expect a simple SLE$_κ$ in this case.

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