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arXiv 1404.0984hep-lat
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梯度流阶跃标度法连续极限的改进

Improving the continuum limit of gradient flow step scaling

Anqi Cheng, Anna Hasenfratz, Yuzhi Liu, Gregory Petropoulos, David Schaich

摘要:

本文对基于梯度流运行耦合的重整化群阶跃标度函数作了一个非微扰的改进,它可以应用于任何感兴趣的格点规范理论.考虑第一SU(3)规范理论和$N_f = 4$无质量交错费米子,我们证明这种改进可以消除$O(a^2)$晶格伪影,从而增加我们对连续统外推的控制。转向12味系统,我们观察到在无限体积连续极限的红外固定点。应用我们提出的改进通过移除所有可观察到的$O(a^2)$效应来加强这一结论。对于由$c = \sqrt{8t} / L = 0.2$定义的有限体积梯度流重整化格式,我们发现连续共形不动点位于$g_\star^2 = 6.2(2)$

英文摘要:

We introduce a non-perturbative improvement for the renormalization group step scaling function based on the gradient flow running coupling, which may be applied to any lattice gauge theory of interest. Considering first SU(3) gauge theory with $N_f = 4$ massless staggered fermions, we demonstrate that this improvement can remove $O(a^2)$ lattice artifacts, and thereby increases our control over the continuum extrapolation. Turning to the 12-flavor system, we observe an infrared fixed point in the infinite-volume continuum limit. Applying our proposed improvement reinforces this conclusion by removing all observable $O(a^2)$ effects. For the finite-volume gradient flow renormalization scheme defined by $c = \sqrt{8t} / L = 0.2$, we find the continuum conformal fixed point to be located at $g_\star^2 = 6.2(2)$

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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