Wino cold dark matter from anomaly mediated SUSY breaking

The cosmological moduli problem is discussed in the framework of sequestered sector/anomaly mediated supersymmetry (SUSY) breaking. In this scheme, the gravitino mass (corresponding to the moduli masses) is naturally 10-100 TeV, and hence the lifetime of the moduli fields can be shorter than similar to 1 sec. As a result, the cosmological moduli fields should decay before big-bang nucleosynthesis starts. Furthermore, in the anomaly mediated scenario, the lightest superparticle (LSP) is the Wine-like neutralino. Although the large annihilation cross section means the thermal relic density of the Wine LSP is too small to be the dominant component of cold dark matter (CDM), moduli decays can produce Wines in sufficient abundance to constitute CDM. If Wines are indeed the dark matter, it will be highly advantageous from the point of view of detection. If the halo density is dominated by the Wine-like LSP, the detection rate of Wine CDM in Ge detectors can be as large as 0.1-0.01 event/kg/day, which is within the reach of the future CDM detection with Ge detector. Furthermore, there is a significant positron signal from pair annihilation of Wines in our galaxy which may give a spectacular signal at AMS. (C) 2000 Elsevier Science B.V. All rights reserved.