  We consider rotational holographic transport in strongly coupled 2+1
dimensional systems, from the point of view of 3+1 dimensional gravity. We
consider the moment of inertia $I$ as a kind of transport coefficient,
identified with the moment of inertia of a charged rotating black hole in
$AdS_4$ background. In the low-temperature region, we find the behaviour of the
density $I/A$ with temperature $T$ and angular velocity $\Omega$, and find a
quadratic behaviour for $\partial(I/A)/\partial\Omega$ with $T$, in the
presence of some charge $Q$.
