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arXiv 1509.03345hep-phhep-latnucl-th
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磁化的有效QCD phase diagram

The magnetized effective QCD phase diagram

Alejandro Ayala, C. A. Dominguez, L. A. Hernandez, M. Loewe, R. Zamora

摘要:

利用耦合到夸克的线性西格玛模型,研究了有磁场存在时温度-夸克化学势平面上的QCD相图。结果表明,该模型中得到的耦合随场强的增加而减小,导致相变的临界温度随场强的增加而减小(逆磁催化)。如果适当考虑血浆筛选,则会发生这种情况。随着场强的增加,相图中临界终点(CEP)的位置向临界夸克化学势的低值和临界温度的大值移动。此外,CEP接近大磁场值的温度轴。我们认为,类似的行为是预期在QCD,因为物理影响的磁场,无论强度,是产生一个空间维度减少,从而虚夸克-反夸克对更接近平均,因此,他们的相互作用的强度降低,由于渐近自由。

英文摘要:

The QCD phase diagram in the temperature versus quark chemical potential plane is studied in the presence of a magnetic field, using the linear sigma model coupled to quarks. It is shown that the decrease of the couplings with increasing field strength obtained in this model leads to the critical temperature for the phase transition to decrease with increasing field intensity (inverse magnetic catalysis). This happens provided that plasma screening is properly accounted for. It is also found that with increasing field strength the location of the critical end point (CEP) in the phase diagram moves toward lower values of the critical quark chemical potential and larger values of the critical temperature. In addition, the CEP approaches the temperature axis for large values of the magnetic field. We argue that a similar behavior is to be expected in QCD, since the physical impact of the magnetic field, regardless of strength, is to produce a spatial dimension reduction, whereby virtual quark-antiquark pairs are closer on average and thus, the strength of their interaction decreases due to asymptotic freedom.

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