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arXiv 1303.0441hep-latquant-ph
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Schwinger模型和某些量子自旋模型的数值研究

Numerical investigations of the Schwinger model and selected quantum spin models

Marcin Szyniszewski

摘要:

用精确对角化、数值重整化和密度矩阵重整化群方法对XY模型、Heisenberg模型和J-J' Heisenberg模型进行了数值研究。得到了低能级,并进行了有限尺寸标度,以估计体极限值。计算结果与精确值一致。DMRG的结果被认为是最有前途的。Schwinger模型也研究了使用精确对角化和强耦合展开。探讨了无质量模型、有质量模型和有背景电场模型。基态能量,标量和矢量粒子质量和序参量进行了检查。观察到所实现的值与以前的结果和理论预测是一致的。展望了今后的研究方向。

英文摘要:

Numerical investigations of the XY model, the Heisenberg model and the J-J' Heisenberg model are conducted, using the exact diagonalisation, the numerical renormalisation and the density matrix renormalisation group approach. The low-lying energy levels are obtained and finite size scaling is performed to estimate the bulk limit values. The results are found to be consistent with the exact values. The DMRG results are found to be most promising. The Schwinger model is also studied using the exact diagonalisation and the strong coupling expansion. The massless, the massive model and the model with a background electric field are explored. Ground state energy, scalar and vector particle masses and order parameters are examined. The achieved values are observed to be consistent with previous results and theoretical predictions. Path to the future studies is outlined.

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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