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arXiv 1502.08011hep-ph
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QCD中的磁催化和反磁催化

Magnetic catalysis and inverse magnetic catalysis in QCD

Niklas Mueller, Jan M. Pawlowski

摘要:

通过求解胶子和夸克能隙方程,研究了强磁场对零密度下QCD相结构的影响,并通过研究夸克与四费米耦合的散射动力学,讨论了强磁场对零密度下QCD相结构的影响.计算了手性交叉温度和手性缩合物。对于渐近大的磁场,我们发现磁催化,而我们发现反向磁催化中间磁场。此外,对于大磁场,无质量夸克的手征相变变成了交叉。基本的机制,然后分析研究在几个简化的完整的数值分析。我们发现,胶子屏蔽效应和强耦合的削弱相结合是负催化现象的原因。反过来,大磁场下的磁催化作用已经通过基于维数的简单论证来表示。

英文摘要:

We investigate the effects of strong magnetic fields on the QCD phase structure at vanishing density by solving the gluon and quark gap equations, and by studying the dynamics of the quark scattering with the four-fermi coupling. The chiral crossover temperature as well as the chiral condensate are computed. For asymptotically large magnetic fields we find magnetic catalysis, while we find inverse magnetic catalysis for intermediate magnetic fields. Moreover, for large magnetic fields the chiral phase transition for massless quarks turns into a crossover. The underlying mechanisms are then investigated analytically within a few simplifications of the full numerical analysis. We find that a combination of gluon screening effects and the weakening of the strong coupling is responsible for the phenomenon of inverse catalysis. In turn, the magnetic catalysis at large magnetic field is already indicated by simple arguments based on dimensionality.

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