  We report a mathematical equivalence between certain models of universe
relying on domain-walls and noncommutative geometries. It is shown that a
two-brane world made of two domain-walls can be seen as a "noncommutative"
two-sheeted spacetime under certain assumptions. This equivalence also implies
a model-independent phenomenology which is presently studied. Matter swapping
between the two branes (or sheets) is predicted through fermionic oscillations
induced by magnetic vector potentials. This phenomenon, which might be
experimentally studied, could reveal the existence of extra dimensions in a new
and accessible way.
