Microscopic origin of U A (1 ) symmetry violation in the high temperature phase of QCD

Microscopic origin of U A (1 ) symmetry violation in the high temperature phase of QCD
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QCD高温相UA(1)对称性破坏的微观起源

DOI:
10.1103/physrevd.91.094504
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发表时间:
2015
期刊:
影响因子:
5
通讯作者:
S. Sharma
S. Sharma
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
V. Dick;F. Karsch;E. Laermann;S. Mukherjee;S. Sharma

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我们研究了狄拉克矩阵的低阶本征模,目的是更深入地了解QCD中的非对称性的温度依赖性。我们利用重叠算符来探测由高度改进的交错夸克的()-味产生的动力学QCD位形。我们没有发现任何证据的差距开放的本征值谱的红外区域,即使在,是手性交叉温度。相反,我们观察到的近零本征模的积累。我们认为,这些近零的本征模是主要负责的轴对称仍然有效的异常破缺。在,这些近零本征模保持本地化和它们的分布是一致的稀释瞬子气体图片。在这个温度下,瞬子的平均大小为,密度为。
We investigate the low-lying eigenmodes of the Dirac matrix with the aim to gain more insight into the temperature dependence of the anomaloussymmetry in QCD. We use the overlap operator to probe dynamical QCD configurations generated with ()-flavors of highly improved staggered quarks. We find no evidence of a gap opening up in the infrared region of the eigenvalue spectrum even at,being the chiral crossover temperature. Instead, we observe an accumulation of near-zero eigenmodes. We argue that these near-zero eigenmodes are primarily responsible for the anomalous breaking of the axial symmetry still being effective. At, these near-zero eigenmodes remain localized and their distribution is consistent with the dilute instanton gas picture. At this temperature, the average size of the instantons isand their density is.
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