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Gravitational Dark Matter Decay and the ATIC/PPB-BETS Excess · Around

2009

Gravitational Dark Matter Decay and the ATIC/PPB-BETS Excess

Takahashi, Fuminobu, Komatsu, Eiichiro

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The hidden scalar field, which couples to the visible sector only through Planck-suppressed interactions, is a candidate for dark matter owing to its long lifetime.

Decay of such a scalar field offers observational tests of this scenario.
We show that decay of the hidden scalar field can explain the observed excess of high-energy positrons/electrons observed by ATIC/PPB-BETS, for a suitable choice of the mass and the vacuum expectation value of the field.
We also show that the same choice of the parameters gives the observed dark matter abundance.

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