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arXiv 1704.04500hep-thcond-mat.stat-mechcond-mat.str-elhep-lat
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从$ϕ^4$理论到二维伊辛模型的RG流

RG Flow from $ϕ^4$ Theory to the 2D Ising Model

Nikhil Anand, Vincent X. Genest, Emanuel Katz, Zuhair U. Khandker, Matthew T. Walters

摘要:

本文利用最近提出的保角截断方法研究了1+1维$ϕ^4$理论。从自由场论的紫外CFT出发,构造了一个具有确定共形Casimir的完备态基,即$\mathcal{C}$。我们用这些态来表示光锥量子化中完全相互作用理论的哈密顿量。在用$\mathcal{C} \leq \mathcal{C}_{\max}$截断态后,我们数值对角化了强耦合下的哈密顿量,并研究了由此产生的IR动力学。我们计算了几个局部算子的非微扰谱密度,它们等价于实时的、无限体积的关联函数。这些谱密度,其中包括Zamolodchikov $C$ -功能沿整个RG流,是可计算的任何值的耦合。在临界附近,我们的数值结果再现了二维伊辛模型中的关联函数。

英文摘要:

We study 1+1 dimensional $ϕ^4$ theory using the recently proposed method of conformal truncation. Starting in the UV CFT of free field theory, we construct a complete basis of states with definite conformal Casimir, $\mathcal{C}$. We use these states to express the Hamiltonian of the full interacting theory in lightcone quantization. After truncating to states with $\mathcal{C} \leq \mathcal{C}_{\max}$, we numerically diagonalize the Hamiltonian at strong coupling and study the resulting IR dynamics. We compute non-perturbative spectral densities of several local operators, which are equivalent to real-time, infinite-volume correlation functions. These spectral densities, which include the Zamolodchikov $C$-function along the full RG flow, are calculable at any value of the coupling. Near criticality, our numerical results reproduce correlation functions in the 2D Ising model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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