Dark matter may be undetectable

Super-WIMPs might hide ninety percent of the universe.

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Feng, J. L., Rajaraman, A. & Takayama, F. Superweakly interacting massive particles. Physical Review Letters, 91, 011302, (2003).
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Feng, J. L., Rajaraman, A. & Takayama, F. SuperWIMP dark matter signals from the early universe. Preprint, http://xxx.arxiv.org/abs/hep-ph/0306024 (2003).

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Philip Ball
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Ball, P. Dark matter may be undetectable. Nature (2003). https://doi.org/10.1038/news030707-2