Mathematics – Logic
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005idm..conf...81b&link_type=abstract
THE IDENTIFICATION OF DARK MATTER. Proceedings of the Fifth International Workshop. Held 6-10 September 2004 in Edinburgh, UK. E
Mathematics
Logic
Scientific paper
We study the cosmological origin of small-scale DM clumps with mass ≲ 103M&sun; in the hierarchical scenario with most conservative assumption of adiabatic gaussian fluctuations. The main included effect (tidal interaction) results in the formation of large core in the center of a clump and in tidal destruction of large fraction of the clumps. The mass distribution of clumps has a cutoff at Mmin due to diffusion of DM particles out of a fluctuation and free streaming at later stage. Mmin is a model dependent quantity. In the case the neutralino, considered as a pure bino, is a DM particle, Mmin ~ 10-8M&sun;. The enhancement of annihilation signal due to DM clumpiness in the Galactic halo, valid for arbitrary DM particles, is calculated. For observationally preferable value of index or primeval fluctuation spectrum np ≈ 1, the enhancement of an annihilation signal is described by a factor 2 - 5 depending on the density profile in a clump.
Berezinsky Veniamin S.
Dokuchaev Viacheslav I.
Eroshenko Yu. N.
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