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Abstract: The annihilation of dark matter DM in the Galaxy could produce specificimprints on the spectra of antimatter species in Galactic cosmic rays, whichcould be detected by upcoming experiments such as PAMELA and AMS02. Recentstudies show that the presence of substructures can enhance the annihilationsignal by a -boost factor- that not only depends on energy, but that isintrinsically a statistical property of the distribution of DM substructuresinside the Milky Way. We investigate a scenario in which substructures consistof $\sim 100$ -mini-spikes- around intermediate-mass black holes. Focusing onprimary positrons and antiprotons, we find large boost factors, up to a fewthousand, that exhibit a large variance at high energy in the case of positronsand at low energy in the case of antiprotons. As a consequence, an estimate ofthe DM particle mass based on the observed cut-off in the positron spectrumcould lead to a substantial underestimate of its actual value.



Author: P. Brun, G. Bertone, J. Lavalle, P. Salati, R. Taillet

Source: https://arxiv.org/







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