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Cold dark matter may be made of superweakly-interacting massive particles,superWIMPs, that naturally inherit the desired relic density from late decaysof metastable WIMPs. Well-motivated examples are weak-scale gravitinos insupergravity and Kaluza-Klein gravitons from extra dimensions. These particlesare impossible to detect in all dark matter experiments. We find, however, thatsuperWIMP dark matter may be discovered through cosmological signatures fromthe early universe. In particular, superWIMP dark matter has observableconsequences for Big Bang nucleosynthesis and the cosmic microwave background(CMB), and may explain the observed underabundance of 7Li without upsetting theconcordance between deuterium and CMB baryometers. We discuss implications forfuture probes of CMB black body distortions and collider searches for newparticles. In the course of this study, we also present a model-independentanalysis of entropy production from late-decaying particles in light of WMAPdata.Comment: 19 pages, 5 figures, typos correcte

Superweakly interacting massive particle dark matter signals from the early Universe