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Spectrum of the Wilson-Fisher conformal field theory on the torus

机译:圆环上的Wilson-Fisher共形场理论的谱

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摘要

We study the finite-size spectrum of the O(N)-symmetric Wilson-Fisher conformal field theory (CFT) on the (d = 2)-spatial-dimension torus using the expansion in e = 3 - d. This is done by deriving a set of universal effective Hamiltonians describing fluctuations of the zero-momentum modes. The effective Hamiltonians take the form of iV-dimensional quantum anharmonic oscillators, which are shown to be strongly coupled at the critical point for small e. The low-energy spectrum is solved numerically for N = 1,2,3,4. Using exact diagonalization, we also numerically study explicit lattice models known to be in the 0(2) and 0(3) universality class, obtaining estimates of the low-lying critical spectrum. The analytic and numerical results show excellent agreement and the critical low-energy torus spectra are qualitatively different among the studied CFTs, identifying them as a useful fingerprint for detecting the universality class of a quantum critical point.
机译:我们使用(e = 3-d)的展开研究(d = 2)-空间维环面上O(N)对称的Wilson-Fisher共形场理论(CFT)的有限尺寸谱。这是通过推导描述零动量模式波动的一组通用有效哈密顿量来完成的。有效的哈密顿量采用iV维量子非谐振荡器的形式,在小e的临界点上显示出强耦合。对于N = 1,2,3,4,低能谱通过数值求解。使用精确的对角线化,我们还对已知在0(2)和0(3)通用性类别中的显式晶格模型进行了数值研究,从而获得了低关键光谱的估计。解析和数值结果表明,所研究的CFT之间具有极好的一致性,并且临界低能环面光谱在质上有所不同,从而将它们识别为检测量子临界点通用性类的有用指纹。

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  • 来源
    《Physical review》 |2017年第3期|035142.1-035142.23|共23页
  • 作者单位

    Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA;

    Institut fur Theoretische Physik, Universitat Innsbruck, A-6020 Innsbruck, Austria;

    Institut fur Theoretische Physik, Universitat Innsbruck, A-6020 Innsbruck, Austria;

    Institut fur Theoretische Physik, Universitat Innsbruck, A-6020 Innsbruck, Austria;

    Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA,Perimeter Institute for Theoretical Physics, Waterloo, Ontario, Canada N2L2Y5;

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