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arXiv 0902.2587hep-lat
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畴壁费米子模拟中残余手征对称性破缺的控制

Controlling Residual Chiral Symmetry Breaking in Domain Wall Fermion Simulations

Dwight Renfrew, Thomas Blum, Norman Christ, Robert Mawhinney, Pavlos Vranas

摘要:

在较强的规范场耦合下,畴壁费米子剩余质量(手征对称性破缺的量度)迅速增长。这一措施主要是由于近零费米子本征模的对数的4D传输矩阵沿第五维,这些本征模在强耦合迅速增加。为了抑制这些本征模,我们已经添加了一个乘法加权因子的比例的威尔逊-狄拉克费米子具有手征扭曲的质量与一个大的负实分量和一个小的虚手征分量的决定因素的路径积分。数值结果表明,这种加权因子与适当的扭曲质量的选择显着抑制剩余质量,同时允许足够的拓扑隧道。

英文摘要:

At stronger gauge-field couplings, the domain wall fermion (DWF) residual mass, a measure of chiral symmetry breaking, grows rapidly. This measure is largely due to near zero fermion eigenmodes of logarithm of the 4D transfer matrix along the fifth dimension, and these eigenmodes increase rapidly at strong coupling. To suppress these eigenmodes, we have added to the DWF path integral a multiplicative weighting factor consisting of a ratio of determinants of Wilson-Dirac fermions having a chirally twisted mass with a large negative real component and a small imaginary chiral component. Numerical results show that this weighting factor with an appropriate choice of twisted masses significantly suppresses the residual mass while allowing adequate topological tunneling.

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