For a holographic model with fractional non-abelian gauge fields, the DC conductivity is σ = (1 - 4 q1 h'(rh)^2)/(1 + 4 q1 h'(rh)^2)^3, which is below the usual lower bound for nonzero coupling.
Electromagnetic wave propagation inside a material medium: an effective geometry interpretation
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We present a method developed to deal with electromagnetic wave propagation inside a material medium that reacts, in general, non-linearly to the field strength. We work in the context of Maxwell' s theory in the low frequency limit and obtain a geometrical representation of light paths for each case presented. The isotropic case and artificial birefringence caused by an external electric field are analyzed as an application of the formalism and the effective geometry associated to the wave propagation is exhibited.
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Nonlinear Yang-Mills AdS black brane and DC conductivity
For a holographic model with fractional non-abelian gauge fields, the DC conductivity is σ = (1 - 4 q1 h'(rh)^2)/(1 + 4 q1 h'(rh)^2)^3, which is below the usual lower bound for nonzero coupling.