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arXiv 0910.3216hep-lat
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具有8和12种简并夸克味的格点量子色动力学

Lattice QCD with 8 and 12 degenerate quark flavors

Xiao-Yong Jin, Robert D. Mawhinney

摘要:

我们比较广泛的模拟QCD与8和12口味的简并夸克,使用DBW2规范作用,天真交错费米子,和合理的混合蒙特卡罗算法。各种各样的值的耦合常数,夸克质量,晶格尺寸已被使用。我们的数据表明,随着裸耦合的减少,一个快速的交叉,这大大改变了晶格规模,存在8和12的味道。这种交叉的规模变化在12种口味的情况下比在8种口味的情况下大得多。我们在零温度和有限温度系统中测量的所有观测值都与零温度理论在快速交叉的弱耦合侧的手征对称性破缺相一致。

英文摘要:

We compare extensive simulations of QCD with 8 and 12 flavors of degenerate quarks, using the DBW2 gauge action, naive staggered fermions, and the rational hybrid Monte Carlo algorithm. A variety of values of the coupling constant, quark mass, and lattice size have been used. Our data suggests that, as the bare coupling is decreased, a rapid cross-over, which dramatically changes the lattice scale, exists with both 8 and 12 flavors. The scale change across this cross-over is much larger with 12 flavors than it is with 8 flavors. All of the observables we have measured, in both the zero and finite temperature systems, are consistent with a chiral symmetry breaking phase for the zero temperature theory on the weak coupling side of the rapid cross-over.

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