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arXiv 0810.0946hep-lat
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大格点上夸克行列式的涨落和重权

Fluctuations and reweighting of the quark determinant on large lattices

Martin Lüscher, Filippo Palombi

摘要:

我们建议通过将夸克行列式分解为两个因子,并将包含狄拉克算符低模贡献的因子作为重加权因子,来稳定含极轻Wilson夸克的格点量子色动力学的HMC模拟.一般来说,行列式重加权在大晶格上变得低效,因为夸克行列式的统计涨落随晶格体积呈指数增长。随机矩阵理论和一些数值研究现在表明,低模式的行列式的贡献表现不同,这允许因式分解设计,保持大晶格上的模拟效率。

英文摘要:

We propose to stabilise HMC simulations of lattice QCD with very light Wilson quarks by splitting the quark determinant into two factors and by treating the factor that includes the contribution of the low modes of the Dirac operator as a reweighting factor. In general, determinant reweighting becomes inefficient on large lattices, because the statistical fluctuations of quark determinants increase exponentially with the lattice volume. Random matrix theory and some numerical studies now suggest that the low-mode contribution to the determinant behaves differently, which allows factorisations to be devised that preserve the efficiency of the simulation on large lattices.

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