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.
Hydrodynamics of Arcsin AdS Black Brane
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In this paper, we explore a modified black brane within AdS spacetime, characterized by the Lagrangian density $\frac{1}{q} \text{arcsin}(qR)-2\Lambda$. Due to the absence of an analytic solution, we approach the Einstein equations using a perturbative method, extending our analysis to the second order in $q$. Subsequently, we compute the ratio of shear viscosity to entropy density. Our results suggest that the KSS Bound is not saturated in this model.
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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.