M. S. Boucenna, R. A. Lineros, J. W. F. Valle
Weakly Interactive Massive Particles are among the most motivated candidates invoked to solve the Dark Matter puzzle. The stability of Dark Matter (DM) typically results from a global protective symmetry. However, the presence of gravitational effects may cause its explicit breaking. We study the presence of such effects on WIMPs and show that in addition to providing a new source of signal for indirect DM searches and an interplay with direct detection, a large class of decaying Dark Matter models can be embedded into the WIMP paradigm. Taking into account the recent limits on DM lifetimes, we show that forbidding only the dimension five (Planck--suppressed) operators is generally sufficient to ensure the validity of the WIMP candidate.
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http://arxiv.org/abs/1204.2576
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