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Two component dark matter · Around

2008

Two component dark matter

Fairbairn, Malcolm, Zupan, Jure

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We explain the PAMELA positron excess and the PPB-BETS/ATIC e+ + e- data using a simple two component dark matter model (2DM).

The two particle species in the dark matter sector are assumed to be in thermal equilibrium in the early universe.
While one particle is stable and is the present day dark matter, the second one is metastable and decays after the universe is 10^-8 s old.
In this model it is simple to accommodate the large boost factors required to explain the PAMELA positron excess without the need for large spikes in the local dark matter density.

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