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arXiv 1211.7293hep-phhep-thnucl-th
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强磁场中的双色QCD:Polyakov环的作用

Two-color QCD in a strong magnetic field: The role of the Polyakov loop

Jens O. Andersen, Arturo A. Cruz

摘要:

利用Polyakov圈扩展的双味双色NJL模型研究了有限温度下外磁背景中的双色QCD。在T=0时,计算了手性凝聚物,发现它作为磁场$B$的函数而增加。在手征极限中,对于非零磁场$B$,解禁闭跃迁低于手征跃迁。在物理点上,这两个转变似乎是一致的场强高达$|qB|\approx 5m_π^2$,然后他们分裂。在手性极限和物理点处,两者之间的分裂作为$B$的函数增加。在从零磁场到$|qB|=20 m_π^2$的范围内,手性跃迁的跃迁温度增加了约35 MeV,而去禁闭的跃迁温度基本上是恒定的。

英文摘要:

We study two-color QCD in an external magnetic backround at finite temperature using the Polyakov-loop extended two-flavor two-color NJL model. At T=0, the chiral condensate is calculated and it is found to increase as a function of the magnetic field $B$. In the chiral limit the deconfinement transition lies below the chiral transition for nonzero magnetic fields $B$. At the physical point, the two transitions seem to coincide for field strengths up to $|qB|\approx 5m_π^2$ whereafter they split. The splitting between the two increases as a function of $B$ in both the chiral limit and at the physical point. In the range from zero magnetic field and $|qB|=20 m_π^2$, the transition temperature for the chiral transition increases by approximately 35 MeV, while the transition temperature for deconfinement is essentially constant.

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