Enhanced dynamo growth in nonhomogeneous conducting fluids

We address magnetic-field generation by dynamo action in systems with inhomogeneous electrical conductivity and magnetic permeability. More specifically, we first show that the Taylor-Couette kinematic undergoes a drastic reduction of its stability threshold when (zero-mean) modulation fluid's or permeability is introduced. These results are obtained outside mean-field regime, for which this effect was initially proposed. Beyond illustrative example, extend duality argument put forward Favier Proctor (2013) to swapping distributions changing $u\ensuremath{\rightarrow}\ensuremath{-}u$ leaves unchanged. This allows one make connections between priori unrelated studies. Finally, discuss possibility observing such an both laboratory astrophysical settings.