Ballon-Bayona, Alfonso [UNESP]N. Ferreira, CristineVasquez Otoya, Victor J.2014-05-272014-05-272013-05-21Physical Review D - Particles, Fields, Gravitation and Cosmology, v. 87, n. 10, 2013.1550-79981550-2368http://hdl.handle.net/11449/75422We provide a simple method for writing the Dirac-Born-Infeld 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 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. © 2013 American Physical Society.engArtigo10.1103/PhysRevD.87.106007WOS:000319284100011Acesso aberto2-s2.0-848779705572-s2.0-84877970557.pdf