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arXiv 1609.00210hep-lat
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关于扭曲边界条件的加权

On reweighting for twisted boundary conditions

Andrea Bussone, Michele Della Morte, Martin Hansen, Claudio Pica

摘要:

我们考虑了在格点规范理论的模拟中,当扭曲边界条件施加在价费米子上时,为了校正么正性的破坏而使用重权技术的可能性。首先,我们研究的性质,重新加权因子和它们的方差在树的水平。这使我们引入了费米子重权行列式的因式分解。在数值,随机,实施的方法,我们发现,在大体积的情况下,重新加权的效果是可以忽略不计的,但它是相当大的体积小,扭转角大。更重要的是,我们发现,对于未改进的威尔逊费米子,并在小体积,临界夸克质量的扭曲角的依赖性是相当明显的,并导致大的违反连续色散关系。

英文摘要:

We consider the possibility of using reweighting techniques in order to correct for the breaking of unitarity when twisted boundary conditions are imposed on valence fermions in simulations of lattice gauge theories. We start by studying the properties of reweighting factors and their variances at tree-level. That leads us to the introduction of a factorization for the fermionic reweighting determinant. In the numerical, stochastic, implementation of the method, we find that the effect of reweighting is negligible in the case of large volumes but it is sizeable when the volumes are small and the twisting angles are large. More importantly, we find that for un-improved Wilson fermions, and in small volumes, the dependence of the critical quark mass on the twisting angle is quite pronounced and results in large violations of the continuum dispersion relation.

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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