Dark Matter in Anomalous $U(1)'$ Models with neutral mixing
  We study the lightest masses in the fermionic sector of an anomalous $U(1)'$
extension of the minimal supersymmetric standard model inspired by brane
constructions. The LSP of this model is an XWIMP (extremely weak interaction
particle) which is shown to have a relic density satisfying WMAP data. This
computation is carried out numerically after having adapted the DarkSUSY
package to our case.
