1 research outputs found
Dark matter halos in the multicomponent model. II. Density profiles of galactic halos
The multicomponent dark matter model with self-scattering and
inter-conversions of species into one another is an alternative dark matter
paradigm that is capable of resolving the long-standing problems of
CDM cosmology at small scales. In this paper, we have studied in
detail the properties of dark matter halos with obtained in -body cosmological simulations with the simplest
two-component (2cDM) model. A large set of velocity-dependent cross-section
prescriptions for elastic scattering and mass conversions, and , has been explored and the results
were compared with observational data. The results demonstrate that
self-interactions with the cross-section per particle mass evaluated at
km s being in the range of
cmg robustly suppress central cusps, thus resolving the core-cusp
problem. The core radii are controlled by the values of and the DM
cross-section's velocity-dependent power-law indices , but are
largely insensitive to the species' mass degeneracy. These values are in full
agreement with those resolving the substructure and too-big-to-fail problems.
We have also studied the evolution of halos in the 2cDM model with cosmic time.Comment: 17 pages, 13 figure