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arXiv 1208.3475hep-latcond-mat.dis-nnhep-phhep-th
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QCD Dirac谱中Poisson到随机矩阵的跃迁

Poisson to Random Matrix Transition in the QCD Dirac Spectrum

Tamas G. Kovacs, Ferenc Pittler

摘要:

在零温度下,QCD狄拉克算符谱的最低部分由随机矩阵统计描述的离域模组成。在本文中,我们表明,这些本征模的性质急剧变化时,系统是通过有限的温度驱动的交叉。在低温下离域的最低狄拉克模式在逆温度的尺度上变得局域化。同时,谱统计量也从随机矩阵变为泊松统计量。我们证明了这一点与格点量子色动力学模拟使用2+1口味的轻动力学夸克的物理质量。画一个类比与安德森过渡,我们也研究了流动性边缘分离本地化和离域模式的频谱。我们发现,它的规模在连续极限和急剧增加的温度。

英文摘要:

At zero temperature the lowest part of the spectrum of the QCD Dirac operator is known to consist of delocalized modes that are described by random matrix statistics. In the present paper we show that the nature of these eigenmodes changes drastically when the system is driven through the finite temperature cross-over. The lowest Dirac modes that are delocalized at low temperature become localized on the scale of the inverse temperature. At the same time the spectral statistics changes from random matrix to Poisson statistics. We demonstrate this with lattice QCD simulations using 2+1 flavors of light dynamical quarks with physical masses. Drawing an analogy with Anderson transitions we also examine the mobility edge separating localized and delocalized modes in the spectrum. We show that it scales in the continuum limit and increases sharply with the temperature.

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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