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2007

Gamma Ray Spectrum from Gravitino Dark Matter Decay

Ibarra, Alejandro, Tran, David

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Gravitinos are very promising candidates for the cold dark matter of the Universe.

Interestingly, to achieve a sufficiently long gravitino lifetime, R-parity conservation is not required, thus preventing any dangerous cosmological influence of the next-to-lightest supersymmetric particle.
When R-parity is violated, gravitinos decay into photons and other particles with a lifetime much longer than the age of the Universe, producing a diffuse gamma ray flux with a characteristic spectrum that could be measured in future experiments, like GLAST or AMS-02.
In this letter we compute the energy spectrum of photons from gravitino decay and discuss its main qualitative features.

Gamma Ray Spectrum from Gravitino Dark Matter Decay · Around

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G. Bertone, W. Buchmüller, L. Covi and A. Ibarra, arXiv:0709.2299 [astro-ph]

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