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Note on anomalous currents for a free theory

机译:关于自由理论的异常电流的注意事项

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Recently it was found that, due to Weyl anomaly, an external magnetic field can induce anomalous currents near a boundary. In this paper, we study anomalous currents for complex scalars and Dirac fields in general dimensions. We develop a perturbation method to calculate Green’s function in the spacetime with boundaries. By applying this method, we obtain anomalous currents up to the linear order of magnetic fields in a half space and in a strip. To the best of our knowledge, the results for Dirac fermions and for strips are new. It is remarkable that, unlike the scalars and holographic boundary conformal field theory, the anomalous currents of Dirac fields are independent of boundary conditions in general dimensions. Besides, the currents of Dirac fields are always larger than those of complex scalars. Finally, we find an exact formal expression of the anomalous current in a half space. The result is expressed in momentum integrals, which can be evaluated numerically. We find that the mass suppresses the anomalous currents as expected.
机译:最近发现,由于Weyl异常,外部磁场可以在边界附近引起异常电流。在本文中,我们研究了一般尺寸的复杂标量和狄拉克领域的异常电流。我们开发了一种扰动方法来计算使用边界的时空中的绿色函数。通过应用这种方法,我们获得了半空间和条带中磁场的线性顺序的异常电流。据我们所知,Dirac Fermions和STRIPS的结果是新的。值得注意的是,与标量和全息边界边界保形场理论不同,DIAC场的异常电流与一般尺寸的边界条件无关。此外,DIRAC字段的电流总是大于复制的标量。最后,我们发现半空间中的异常电流的确切正式表达。结果以数量积分表示,可以在数值上进行评估。我们发现质量抑制了预期的异常电流。

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