arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1011.3175hep-lathep-phhep-th
收藏

高温QCD Dirac谱中的泊松统计

Poisson Statistics in the High Temperature QCD Dirac Spectrum

Tamas G. Kovacs, Ferenc Pittler

摘要:

在低温下,QCD的狄拉克谱的低端由随机矩阵理论描述。相比之下,在高温,手性对称相,没有类似的良好建立的静态描述。使用晶格模拟,我们表明,在高温下的一个频带的极端本地化的本征模出现在低端的狄拉克光谱。相应的特征值是统计独立的,并服从广义泊松分布。在谱的更高处,泊松分布迅速过渡到由具有相应对称性的随机矩阵系综预测的体分布。我们的结果是基于淬火晶格模拟的重叠和交错狄拉克运营商做好以上的临界温度在几个体积和值的$N_t$。我们还讨论了费米子边界条件和Polyakov环在这一现象中所起的关键作用。

英文摘要:

At low temperature in the epsilon regime of QCD the low-end of the Dirac spectrum is described by random matrix theory. In contrast, there has been no similarly well established staistical description in the high temperature, chirally symmetric phase. Using lattice simulations we show that at high temperature a band of extremely localized eigenmodes appear at the low-end of the Dirac spectrum. The corresponding eigenvalues are statistically independent and obey a generalized Poisson distribution. Higher up in the spectrum the Poisson distribution rapidly crosses over into the bulk distribution predicted by the random matrix ensemble with the corresponding symmetry. Our results are based on quenched lattice simulations with the overlap and the staggered Dirac operator done well above the critical temperature at several volumes and values of $N_t$. We also discuss the crucial role played by the fermionic boundary condition and the Polyakov-loop in this phenomenon.

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。

↑