标题： DBI方程和全息直流电导率 显示英文标题

标题： DBI equations and holographic DC conductivity

摘要： 我们提供了一种简单的方法，用于在任意静态背景中写出Dp膜的Dirac-Born-Infeld (DBI)方程，该背景的度规仅依赖于全息径向坐标z。 使用这种方法，我们重新审视Karch-O'Bannon的方法，在存在恒定电场和磁场的情况下，计算边界为四维或三维且满足均匀性和各向同性的背景中的直流电导率。 我们找到了一个与框架无关的直流电导率张量表达式。 对于特定的背景，我们恢复了全息金属和奇异金属的先前结果。 显示英文摘要

摘要： We provide a simple method for writing the Dirac-Born-Infeld (DBI) equations of a Dp-brane in an arbitrary static background whose metric depends only on the holographic radial coordinate z. Using this method we revisit the Karch-O'Bannon's procedure to calculate the DC conductivity in the presence of constant electric and magnetic fields for backgrounds where the boundary is four or three dimensional and satisfies homogeneity and isotropy. We find a frame-independent expression for the DC conductivity tensor. For particular backgrounds we recover previous results on holographic metals and strange metals.