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arXiv 2205.08883hep-lat
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三维非阿贝尔规范理论的张量重整化群研究

Toward tensor renormalization group study of three-dimensional non-Abelian gauge theory

Takaaki Kuwahara, Asato Tsuchiya

摘要:

提出了一种将规范场上的路径积分表示为张量网络的方法。我们引入了一个具有变分参数的试作用量,并利用试作用量定义的权值生成了规范场组态。我们构造了初始张量的指数标记这些规范场配置。我们用初始张量进行张量重整化群,并优化变分参数。作为二维以上非阿贝尔规范理论TRG研究的第一步,我们将这种方法应用于三维纯SU(2)规范理论。我们的结果的自由能同意的分析结果在弱和强耦合制度。

英文摘要:

We propose a method to represent the path integral over gauge fields as a tensor network. We introduce a trial action with variational parameters and generate gauge field configurations with the weight defined by the trial action. We construct initial tensors with indices labelling these gauge field configurations. We perform the tensor renormalization group with the initial tensors and optimize the variational parameters. As a first step to the TRG study of non-Abelian gauge theory in more than two dimensions, we apply this method to three-dimensional pure SU(2) gauge theory. Our result for the free energy agrees with the analytical results in weak and strong coupling regimes.

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