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arXiv 1404.6969hep-ph
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局域CP破坏的自发产生与逆磁催化

Spontaneous generation of local CP violation and inverse magnetic catalysis

Lang Yu, Hao Liu, Mei Huang

摘要:

在手征对称相中,极化瞬子-反瞬子分子配对在等标量轴矢量通道中诱导了非平凡的排斥相互作用。因此,观察到一个不寻常的性质,在手性恢复阶段,有一个一级相变的自发产生的本地CP破坏和手性不平衡。此外,外磁场会降低CP-奇相变的临界温度,并催化手征不平衡,从而破坏不同手征度之间的夸克配对的手征凝聚.等标量轴向矢量通道中合理的排斥相互作用强度可以很自然地解释外磁场作用下临界温度附近的逆磁催化现象。

英文摘要:

In the chiral symmetric phase, the polarized instanton--anti-instanton molecule pairing induces a nontrivial repulsive interaction in the iso-scalar axial-vector channel. As a consequence, one unusual property is observed that in the chiral restoration phase, there is a first order phase transition for the spontaneous generation of local CP violation and chiral imbalance. Furthermore, it is found that external magnetic fields will lower the critical temperature for the local CP-odd phase transition and catalyze the chiral imbalance, which destroys the chiral condensate with pairing quarks between different chiralities. A reasonable strength of the repulsive interaction in the iso-scalar axial-vector channel can naturally explain the inverse magnetic catalysis around the critical temperature under external magnetic fields.

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