Geometrisation of Ohm's reciprocity relation in a holographic plasma

It has been pointed out in [1] that the familiar reciprocity relation between the conductivity σ and resistivity ρ should not be expected to hold in all possible settings, but, as argued in [2], is rather a property that may (or may not) emerge as a consequence of specific features, or in certain limits of interest, of a given theory. In this work, I prove the conventional statement: ρ= σ⁻¹, which I refer to as Ohm's reciprocity relation, for a large class of holographic models with $d=3+1$ boundary dimensions. The proof involves a generalisation of the electric-magnetic duality in the $D=4+1$ bulk, the validity of which is discussed in detail. I then confirm these findings by considering one specific model and run numerical simulations in different settings.