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arXiv 2005.00500hep-thhep-lathep-ph
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全息QCD中的磁催化和手性缩合物

Magnetic catalysis and the chiral condensate in holographic QCD

Alfonso Ballon-Bayona, Jonathan P. Shock, Dimitrios Zoakos

摘要:

我们利用全息QCD方法研究了非零磁场对手征凝聚体的影响。我们扩展了Iatrakis,Kiritsis和Paredes在arXiv:1010.1364中提出的模型,该模型实现了5d快子凝聚的手征对称性动态破缺。我们计算的手征凝聚,磁化强度和磁化率的限制和decenefined阶段。该模型导致,在探针近似下,磁催化的手征对称性打破在限制和解除限制相。在手征极限$m_q=0$下,我们发现在退精细相中,足够强的磁场导致从手征恢复相到手征断裂相的二级相变。随着夸克质量的增加,跃迁变成了交叉。由于温度的缩放,手性转变也将被解释为固定磁场的温度转变。我们详细阐述了手征凝聚体,磁化强度和(磁)自由能量密度之间的关系。我们比较了我们在低温和中温下的结果与格点量子色动力学的结果。

英文摘要:

We investigate the effect of a non-zero magnetic field on the chiral condensate using a holographic QCD approach. We extend the model proposed by Iatrakis, Kiritsis and Paredes in arXiv:1010.1364 that realises chiral symmetry breaking dynamically from 5d tachyon condensation. We calculate the chiral condensate, magnetisation and susceptibilities for the confined and deconfined phases. The model leads, in the probe approximation, to magnetic catalysis of chiral symmetry breaking in both confined and deconfined phases. In the chiral limit, $m_q=0$, we find that in the deconfined phase a sufficiently strong magnetic field leads to a second order phase transition from the chirally restored phase to a chirally broken phase. The transition becomes a crossover as the quark mass increases. Due to a scaling in the temperature, the chiral transition will also be interpreted as a transition in the temperature for fixed magnetic field. We elaborate on the relationship between the chiral condensate, magnetisation and the (magnetic) free energy density. We compare our results at low and moderate temperatures temperatures with lattice QCD results.

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