Other
Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1115..175a&link_type=abstract
THE DARK SIDE OF THE UNIVERSE: 4th International Workshop on the Dark Side of the Universe. AIP Conference Proceedings, Volume
Other
3
Cosmology, Dark Matter, Dwarf Galaxies
Scientific paper
The hierarchical clustering inherent in Lambda-Cold Dark Matter cosmology (ΛCDM) seems to produce many of the observed characteristics of large-scale structure. But some glaring problems still remain, including the over-prediction (by a factor 10) of the number of dwarf galaxies within the virialized population of the local group. We carry out a detailed calculation of the dwarf halo evolution incorporating the effects of a hypothesized dark-matter decay, D-->D'+l, where D is the unstable particle, D' is the more massive daughter particle and l is the other, lighter (or possibly massless) daughter particle. This process preferentially heats the smaller halos, expanding them during their evolution and reducing their present-day circular velocity. We find that this mechanism can account very well for the factor 4 deficit in the observed number of systems with velocity 10-20 km s-1 compared to those predicted by the numerical simulations, if Δm/mD'~5-7×10-5, where Δm is the mass difference between the initial and final states. The corresponding lifetime τ cannot be longer than ~30 Gyr, but may be as short as just a few Gyr.
Abdelqader Majd
Melia Fulvio
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