期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 516, 期 2, 页码 1923-1940出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac2207
关键词
astroparticle physics; methods: numerical; galaxies: haloes; dark matter
资金
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [EXC 2121, 390833306, EXC-2094, 390783311, KA 4662/1-1]
- grant PRIN-MIUR 2017 [WSCC32]
- COMPLEX project from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [ERC-2019-AdG 882679]
In this study, the first cosmological simulation of frequent dark matter self-interactions, corresponding to small-angle scatterings, is performed. The results show that overall, large-angle and small-angle scatterings behave similarly with a few exceptions. The number of satellites is considerably suppressed for frequent self-interactions compared to rare self-interactions with the same cross-section. The degeneracy between the two cases may be broken through a combination of multiple measures.
Dark matter (DM) with self-interactions is a promising solution for the small-scale problems of the standard cosmological model. Here we perform the first cosmological simulation of frequent DM self-interactions, corresponding to small-angle DM scatterings. The focus of our analysis lies in finding and understanding differences to the traditionally assumed rare DM (large-angle) self-scatterings. For this purpose, we compute the distribution of DM densities, the matter power spectrum, the two-point correlation function, and the halo and subhalo mass functions. Furthermore, we investigate the density profiles of the DM haloes and their shapes. We find that overall large-angle and small-angle scatterings behave fairly similarly with a few exceptions. In particular, the number of satellites is considerably suppressed for frequent compared to rare self-interactions with the same cross-section. Overall, we observe that while differences between the two cases may be difficult to establish using a single measure, the degeneracy may be broken through a combination of multiple ones. For instance, the combination of satellite counts with halo density or shape profiles could allow discriminating between rare and frequent self-interactions. As a by-product of our analysis, we provide - for the first time - upper limits on the cross-section for frequent self-interactions.
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