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We present a model with dark matter in an anomaly-mediated supersymmetrybreaking hidden sector with a U(1)xU(1) gauge symmetry. The symmetries of themodel stabilize the dark matter and forbid the introduction of new massparameters. As a result, the thermal relic density is completely determined bythe gravitino mass and dimensionless couplings. Assuming non-hierarchicalcouplings, the thermal relic density is ~ 0.1, independent of the dark matter'smass and interaction strength, realizing the WIMPless miracle. The model hasseveral striking features. For particle physics, stability of the dark matteris completely consistent with R-parity violation in the visible sector, withimplications for superpartner collider signatures; also the thermal relic'smass may be ~ 10 GeV or lighter, which is of interest given recent directdetection results. Interesting astrophysical signatures are dark matterself-interactions through a long-range force, and massless hidden photons andfermions that contribute to the number of relativistic degrees of freedom atBBN and CMB. The latter are particularly interesting, given current indicationsfor extra degrees of freedom and near future results from the Planckobservatory.

WIMPless Dark Matter from an AMSB Hidden Sector with No New Mass Parameters