TY  - EJOUR
AU  - Fischer, Moritz S.
AU  - Brüggen, Marcus
AU  - Schmidt-Hoberg, Kai
AU  - Dolag, Klaus
AU  - Kahlhoefer, Felix
AU  - Ragagnin, Antonio
AU  - Robertson, Andrew
TI  - Cosmological simulations with rare and frequent dark matter self-interactions
IS  - DESY-22-072
M1  - PUBDB-2022-01926
M1  - DESY-22-072
M1  - arXiv:2205.02243
PY  - 2022
N1  - 13 pages, 16 figures + appendices, submitted to MNRAS
AB  - 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.
KW  - dark matter, density (INSPIRE)
KW  - scattering, small-angle (INSPIRE)
KW  - dark matter, halo (INSPIRE)
KW  - matter, power spectrum (INSPIRE)
KW  - dark matter, scattering (INSPIRE)
KW  - halo, density (INSPIRE)
KW  - satellite (INSPIRE)
KW  - wide-angle (INSPIRE)
KW  - correlation function (INSPIRE)
KW  - suppression (INSPIRE)
KW  - cosmological model (INSPIRE)
LB  - PUB:(DE-HGF)25
DO  - DOI:10.3204/PUBDB-2022-01926
UR  - https://bib-pubdb1.desy.de/record/477165
ER  -