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arXiv 0709.0932hep-lat
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重叠算子的局域本征模及其对本征值分布的影响

Localized eigenmodes of the overlap operator and their impact on the eigenvalue distribution

Anna Hasenfratz, Roland Hoffmann, Stefan Schaefer

摘要:

在手征对称性自发破缺的系统中,连续Dirac算符的低能本征模得到了推广。在晶格上,由于离散化效应,狄拉克算子可以具有影响对手征对称性敏感的物理量的局部本征模。虽然威尔逊狄拉克算子的红外本征模通常甚至在粗糙晶格上扩展,但手征重叠算子在物理区域中具有许多局部本征模,特别是在混合作用模拟中。取决于它们的密度,这些模式可以引入强晶格伪影。该效果可以通过改变重叠算子的参数来控制,特别是三叶草改进项和重叠投影的中心。

英文摘要:

In a system where chiral symmetry is spontaneously broken, the low energy eigenmodes of the continuum Dirac operator are extended. On the lattice, due to discretization effects, the Dirac operator can have localized eigenmodes that affect physical quantities sensitive to chiral symmetry. While the infrared eigenmodes of the Wilson Dirac operator are usually extended even on coarse lattices, the chiral overlap operator has many localized eigenmodes in the physical region, especially in mixed action simulations. Depending on their density, these modes can introduce strong lattice artifacts. The effect can be controlled by changing the parameters of the overlap operator, in particular the clover improvement term and the center of the overlap projection.

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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