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arXiv 1407.0076hep-thcond-mat.stat-mech
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超越c=1势垒的弦的矩阵模型:随机表面上的自旋-s海森堡模型

A matrix model for strings beyond the c=1 barrier: the spin-s Heisenberg model on random surfaces

J. Ambjorn, Sh. Khachatryan, A. Sedrakyan

摘要:

本文考虑一个耦合到二维量子引力的自旋-s海森堡模型。我们使用费曼路径积分,总结所有可能的二维几何形状和自旋配置的模型。我们正则化这个路径积分开始的R-矩阵定义的自旋-s海森堡模型在一个定期的二维曼哈顿晶格。二维量子引力是通过定义随机曼哈顿格点上的R-矩阵并在这些格点上求和而包含的,其方式与在非临界弦论中使用随机三角剖分对二维几何求和的方式相同。我们建立了一个随机矩阵模型,其中的配分函数再现了自旋-s海森堡模型在所有随机曼哈顿晶格上的退火平均值。本文提出了一种将配分函数中的随机矩阵积分化为特征值上的积分的方法。

英文摘要:

We consider a spin-s Heisenberg model coupled to two-dimensional quantum gravity. We quantize the model using the Feynman path integral, summing over all possible two-dimensional geometries and spin configurations. We regularize this path integral by starting with the R-matrices defining the spin-s Heisenberg model on a regular 2d Manhattan lattice. 2d quantum gravity is included by defining the R-matrices on random Manhattan lattices and summing over these, in the same way as one sums over 2d geometries using random triangulations in non-critical string theory. We formulate a random matrix model where the partition function reproduces the annealed average of the spin-s Heisenberg model over all random Manhattan lattices. A technique is presented which reduces the random matrix integration in partition function to an integration over their eigenvalues.

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