Dark matter halos in the multicomponent model. II. Density profiles of galactic halos

Abstract

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 $\Lambda$CDM cosmology at small scales. In this paper, we have studied in detail the properties of dark matter halos with $M\sim 4-5\times 10^{11}{M}_{\odot }$ obtained in $N$-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, ${\sigma }_s(v)\propto v^{a_s}$ and ${\sigma }_c(v)\propto v^{a_c}$, 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 $v=100$ km s${}^{-1}$ being in the range of $0.01\lesssim {\sigma }_0/m\lesssim 1$ cm${}^2$g${}^{-1}$ robustly suppress central cusps, thus resolving the core-cusp problem. The core radii are controlled by the values of ${\sigma }_0/m$ and the DM cross-section's velocity-dependent power-law indices $(a_s,a_c)$, 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.

arXiv comment17 pages, 13 figures

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