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arXiv 0809.2736hep-lat
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具有化学势的格点量子色动力学的缠绕展开技术

Winding expansion techniques for lattice QCD with chemical potential

Julia Danzer, Christof Gattringer

摘要:

我们解析地导出了具有化学势的Wilson Dirac算符的格点费米子行列式分解为缠绕扇区,即,有固定数量夸克的因子。将格划分为四个区域,行列式分解为可以根据它们组成的闭环的缠绕数进行分类的项。的各个因素表示的子行列式和传播域的晶格。我们数值分析的因式分解公式的性质,并讨论了两个应用程序的确定正则配分函数与一个固定的夸克数:加速傅立叶变换技术通过降维,和幂级数展开。

英文摘要:

We analytically derive a decomposition of the lattice fermion determinant for Wilson's Dirac operator with chemical potential into winding sectors, i.e., factors with a fixed number of quarks. Dividing the lattice into four domains, the determinant is factorized into terms which can be classified with respect to the winding number of the closed loops they consist of. The individual factors are expressed in terms of subdeterminants and propagators on the domains of the lattice. We numerically analyze properties of the factorization formula and discuss two applications for the determination of canonical partition functions with a fixed quark number: A speedup for the Fourier transformation technique through a dimensional reduction, and a power series expansion.

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