论文标题
全息QCD中的磁催化和手性冷凝物
Magnetic catalysis and the chiral condensate in holographic QCD
论文作者
论文摘要
我们使用全息QCD方法研究了非零磁场对手性冷凝物的影响。我们扩展了Arxiv：1010.1364中IATRAKIS，KIRITSIS和PAREDES提出的模型，该模型从5D Tachyon凝结中动态地破裂了手性对称性。我们计算了受限制和脱落相的手性冷凝物，磁化和敏感性。该模型在探针近似中导致手性对称性断裂的磁性催化。在手性极限中，$ m_q = 0 $，我们发现在脱卷相中，一个足够强的磁场会导致从手性修复的相位到手性折断相的二阶相变。随着夸克质量的增加，过渡变成了交叉。由于温度的缩放，手性转变也将被解释为固定磁场温度中的过渡。我们详细介绍了手性冷凝物，磁化和（磁）自由能密度之间的关系。我们将低温和中等温度中的结果与晶格QCD结果进行比较。
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.
