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arXiv 2507.20005hep-thcond-mat.stat-mechcond-mat.str-el
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(2+1)维共形场论微观模型中交叉帽系数的数值提取

Numerical extraction of crosscap coefficients in microscopic models for (2+1)D conformal field theory

Jia-Ming Dong, Yueshui Zhang, Kai-Wen Huang, Hong-Hao Tu, Ying-Hai Wu

AI总结:

本文通过构建晶格和连续模型中的交叉帽态,利用本征态重叠计算揭示了(2+1)维CFT中交叉帽系数的绝对值,与共形bootstrap结果一致,并研究了其有限尺寸缩放和临界扰动下的演变。

摘要:

共形场论(CFT)可以放置在不同的时空流形上,以促进对其性质的研究。对于(2+1)维理论,一种有用的选择是通过将三维球体边界上的反向点识别得到的实射影空间$\mathbb{RP}^3$。标量初级场在该流形上的一点函数通常不为零,并编码所谓的交叉帽系数。这些系数也表现为球面上某些交叉帽态与CFT初级态之间的重叠。以(2+1)维伊辛CFT为例,我们证明交叉帽系数可以从微观模型中提取。我们构建了在多面体上定义的晶格模型和Landau能级中的连续模型中的交叉帽态,其中反向点处的自由度以Bell型态纠缠。通过计算其与许多体哈密顿量本征态的重叠,我们得到了与共形bootstrap一致的结果。重要的是,我们的方法直接揭示了交叉帽重叠的绝对值,而bootstrap计算通常只给出它们的比值。此外,我们还研究了这些重叠的有限尺寸缩放及其在远离临界点的扰动下的演变。

英文摘要:

Conformal field theory (CFT) can be placed on disparate space-time manifolds to facilitate investigations of their properties. For (2+1)-dimensional [(2+1)D] theories, one useful choice is the real projective space $\mathbb{RP}^3$ obtained by identifying antipodal points on the boundary sphere of a three-dimensional ball. One-point functions of scalar primary fields on this manifold generally do not vanish and encode the so-called crosscap coefficients. These coefficients also manifest on the sphere as the overlaps between certain crosscap states and CFT primary states. Taking the (2+1)D Ising CFT as a concrete example, we demonstrate that crosscap coefficients can be extracted from microscopic models. We construct crosscap states in both lattice models defined on polyhedrons and continuum models in Landau levels, where the degrees of freedom at antipodal points are entangled in Bell-type states. By computing their overlaps with the eigenstates of many-body Hamiltonians, we obtain results consistent with those from conformal bootstrap. Importantly, our approach directly reveals the absolute values of crosscap overlaps, whereas bootstrap calculations typically yield only their ratios. Furthermore, we investigate the finite-size scaling of these overlaps and their evolution under perturbations away from criticality.

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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