TY  - JOUR
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
JO  - Monthly notices of the Royal Astronomical Society
VL  - 516
IS  - 2
SN  - 0035-8711
CY  - Oxford
PB  - Oxford Univ. Press
M1  - PUBDB-2022-02948
M1  - arXiv:2205.02243
M1  - DESY-22-072
SP  - 1923 - 1940
PY  - 2022
N1  - 13 pages, 16 figures + appendices, accepted for publication in MNRAS  © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society
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)
KW  - dark matter: interaction (INSPIRE)
KW  - self-force (INSPIRE)
KW  - two-point function (INSPIRE)
KW  - numerical calculations (INSPIRE)
KW  - astroparticle physics (autogen)
KW  - methods: numerical (autogen)
KW  - galaxies: haloes (autogen)
KW  - dark matter (autogen)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000851656200003
DO  - DOI:10.1093/mnras/stac2207
UR  - https://bib-pubdb1.desy.de/record/479234
ER  -