  We investigate whether dark matter can be replaced by various source terms
appearing in the effective Einstein equation, valid on a brane embedded into a
higher dimensional space-time (the bulk). Such non-conventional source terms
include a quadratic (ordinary) matter source term, a geometric source term
originating in the Weyl curvature of the bulk, a source term arising from the
possible asymmetric embedding, and finally the pull-back to the brane of
possible non-standard model bulk fields.
