Relic Densities of Gauged Axions and Supersymmetry
  We illustrate the structure and the main phenomenological features of a
supersymmetric model (the USSM-A) built following a bottom-up approach and
containing an anomalous abelian gauge symmetry. This model supports a gauged
axion in its spectrum and provides a generalization of the global
(supersymmetric) Peccei-Quinn construction. Complete simulations of the
neutralino relic density are performed. Bounds from CAST and WMAP, combined
with dark matter simulations, provide significant constraints on the scale of
the interactions between the axion and the gauge fields.
