  In this paper, we investigate the dynamics inside and outside of black-branes
in anti de Sitter space by numerical simulations using double-null formalism.
We prepare a charged planar matter shell which, due to a negative cosmological
constant, collapses and dynamically forms a black-brane with an apparent
horizon, a singularity and a Cauchy horizon. The gravitational collapse cannot
form a naked overcharged black-brane and hence weak cosmic censorship is safe.
Although mass inflation occurs, the effect is much milder than in the case of
charged black holes; hence, strong cosmic censorship seems not to be safe. We
observed the scalar field dynamics outside the horizon. There should remain a
non-trivial scalar field combination - 'charge cloud' - between the horizon and
the boundary. This can give some meaning in terms of the AdS/CFT
correspondence.
