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
复制标题
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
影响因子:
5
通讯作者:
S. Sharma
中科院分区:
文献类型:
--
作者:
V. Dick;F. Karsch;E. Laermann;S. Mukherjee;S. Sharma
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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