arXiv 0802.37202008-02hep-th

全息QCD对电场和磁场的响应

Response of Holographic QCD to Electric and Magnetic Fields

Oren Bergman, Gilad Lifschytz, Matthew Lippert

备注：: 18 pages, 19 figures; reference added, version published in JHEP
发表信息：: JHEP 0805:007,2008
DOI：: 10.1088/1126-6708/2008/05/007

摘要：

研究了非零温度下大N_c量子色动力学Sakai-Sugimoto全息模型对外部电场和磁场的响应。在电的情况下，我们发现一个一阶绝缘体-导体过渡的限制和decenfining阶段的模型。在退澄清阶段，导体被描述为平行的8-膜-反8-膜嵌入夸克和反夸克流。我们计算的电导率，并表明，它完全同意使用久保公式的计算。在限制相，我们提出了一种新的8-膜嵌入，对应于重子导体。在磁场的情况下，我们表明，手征对称性恢复的临界温度在解除限制相增加的字段和接近一个有限的值在一个无限大的磁场的限制。我们还说明了在不同的阶段的电和磁磁化率的非线性行为。

英文摘要：

We study the response of the Sakai-Sugimoto holographic model of large N_c QCD at nonzero temperature to external electric and magnetic fields. In the electric case we find a first-order insulator-conductor transition in both the confining and deconfining phases of the model. In the deconfining phase the conductor is described by the parallel 8-brane-anti-8-brane embedding with a current of quarks and anti-quarks. We compute the conductivity and show that it agrees precisely with a computation using the Kubo formula. In the confining phase we propose a new kind of 8-brane embedding, corresponding to a baryonic conductor. In the magnetic field case we show that the critical temperature for chiral-symmetry restoration in the deconfined phase increases with the field and approaches a finite value in the limit of an infinite magnetic field. We also illustrate the nonlinear behavior of the electric and magnetic susceptibilities in the different phases.

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英文摘要：

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