Wino cold dark matter from anomaly mediated SUSY breaking

The cosmological moduli problem is discussed in the framework of sequestere d sector/anomaly mediated supersymmetry (SUSY) breaking. In this scheme, th e gravitino mass (corresponding to the moduli masses) is naturally 10-100 T eV, 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 scena rio, the lightest superparticle (LSP) is the Wine-like neutralino. Although the large annihilation cross section means the thermal relic density of th e Wine LSP is too small to be the dominant component of cold dark matter (C DM), moduli decays can produce Wines in sufficient abundance to constitute CDM. If Wines are indeed the dark matter, it will be highly advantageous fr om 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 lar ge as 0.1-0.01 event/kg/day, which is within the reach of the future CDM de tection with Ge detector. Furthermore, there is a significant positron sign al from pair annihilation of Wines in our galaxy which may give a spectacul ar signal at AMS. (C) 2000 Elsevier Science B.V. All rights reserved.