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arXiv math-ph/0611078math-phcond-mat.stat-mechhep-thmath.MPmath.PR
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共形边界环模型

Conformal boundary loop models

Jesper Lykke Jacobsen, Hubert Saleur

摘要:

我们研究了一个模型的密集包装的自避免环上,有关Temperley李代数与一个额外的幂等边界生成。四个不同的权重被赋予循环,这取决于它们的同伦类以及它们是否接触环的外边缘。当可收缩体环x = q + 1/q的权满足-2 < x <= 2时,该模型对其余三个参数的任何实权都是共形不变的.我们对共形边界条件进行了分类,并给出了相应的边界标度维数的精确表达式。严格地计算了具有任何规定数目和类型的不可收缩环的扇区在全配分函数Z中出现的幅度。在此基础上,我们写了一些涉及Z的恒等式,这些恒等式对任何有限大小都成立。当可缩边界环y的权取一定的离散值y_r = [r+1]_q / [r]_q(r为整数)时,建立了其它涉及维拉索罗代数的标准特征标K_{r,s}的恒等式.详细讨论了O(n)模型中Dirichlet和Neumann边界条件的关系,并导出了新的标度维数。当q是单位根且y = y_r时,与A_m型RSOS模型建立了严格的联系。这些涉及到精确的循环和RSOS模型的传输矩阵,在有限的大小有效的频谱之间的关系。最后,将y=y_r的结果与Temperley Lieb布线理论联系起来。

英文摘要:

We study a model of densely packed self-avoiding loops on the annulus, related to the Temperley Lieb algebra with an extra idempotent boundary generator. Four different weights are given to the loops, depending on their homotopy class and whether they touch the outer rim of the annulus. When the weight of a contractible bulk loop x = q + 1/q satisfies -2 < x <= 2, this model is conformally invariant for any real weight of the remaining three parameters. We classify the conformal boundary conditions and give exact expressions for the corresponding boundary scaling dimensions. The amplitudes with which the sectors with any prescribed number and types of non contractible loops appear in the full partition function Z are computed rigorously. Based on this, we write a number of identities involving Z which hold true for any finite size. When the weight of a contractible boundary loop y takes certain discrete values, y_r = [r+1]_q / [r]_q with r integer, other identities involving the standard characters K_{r,s} of the Virasoro algebra are established. The connection with Dirichlet and Neumann boundary conditions in the O(n) model is discussed in detail, and new scaling dimensions are derived. When q is a root of unity and y = y_r, exact connections with the A_m type RSOS model are made. These involve precise relations between the spectra of the loop and RSOS model transfer matrices, valid in finite size. Finally, the results where y=y_r are related to the theory of Temperley Lieb cabling.

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