  Brane world theories contain additional degrees of freedom related to the
geometry of the extra dimension space which can be understood as brane
oscillations (branons). In the case where the fundamental gravitational scale
is much larger than the brane tension scale, these branons are the only extra
degrees of freedom at low energies coming from the extra dimensions. Branons
are generically stable, weakly interacting and massive. They could be produced
in the next generation colliders and at the same time they are natural WIMP
like candidates for dark matter.
