  In brane-world models with low tension, the fluctuations of the brane along
the extra dimensions (branons) are the only relevant new low-energy modes. Such
branon fields are in general massive, stable and weakly interacting, and
accordingly they are natural candidates to explain the universe missing mass
problem. On the other hand, the branon phenomenology is very rich because they
couple to all the Standard Model particles. Distinctive branon signals could be
observed in next colliders and in dark matter searches.
