%0 Journal Article
%A Fischer, Moritz S.
%A Kasselmann, Lenard
%A Brüggen, Marcus
%A Dolag, Klaus
%A Kahlhoefer, Felix
%A Ragagnin, Antonio
%A Robertson, Andrew
%A Schmidt-Hoberg, Kai
%T Cosmological and idealized simulations of dark matter haloes with velocity-dependent, rare and frequent self-interactions
%J Monthly notices of the Royal Astronomical Society
%V 529
%N 3
%@ 0035-8711
%C Oxford
%I Oxford Univ. Press
%M PUBDB-2024-04952
%M arXiv:2310.07750
%M DESY-23-154
%P 2327-2348
%D 2024
%Z 17 pages, 15 figures + appendices, accepted for publication in MNRAS
%X Dark matter self-interactions may have the capability to solve or at least mitigate small-scale problems of the cosmological standard model, Lambda cold dark matter. There are a variety of self-interacting dark matter models that lead to distinguishable astrophysical predictions and hence varying success in explaining observations. Studies of dark matter (DM) density cores on various mass scales suggest a velocity-dependent scattering cross-section. In this work, we investigate how a velocity dependence alters the evolution of the DM distribution for frequent DM scatterings and compare to the velocity-independent case. We demonstrate that these cases are qualitatively different using a test problem. Moreover, we study the evolution of the density profile of idealized DM haloes and find that a velocity dependence can lead to larger core sizes and different time-scales of core formation and core collapse. In cosmological simulations, we investigate the effect of velocity-dependent self-interaction on haloes and satellites in the mass range of ≈10^11– - 10<sup>14</sup>  M<sub>\odot</sub>  - ⁠. We study the abundance of satellites, density, and shape profiles and try to infer qualitative differences between velocity-dependent and velocity-independent scatterings as well as between frequent and rare self-interactions. We find that a strongly velocity-dependent cross-section can significantly amplify the diversity of rotation curves, independent of the angular dependence of the differential cross-section. We further find that the abundance of satellites in general depends on both the velocity dependence and the scattering angle, although the latter is less important for strongly velocity-dependent cross-sections.
%K dark matter: halo (INSPIRE)
%K mass: scale (INSPIRE)
%K dark matter: scattering (INSPIRE)
%K differential cross section: angular dependence (INSPIRE)
%K velocity dependence (INSPIRE)
%K satellite (INSPIRE)
%K dark matter: density (INSPIRE)
%K collapse (INSPIRE)
%K formation (INSPIRE)
%K rotation (INSPIRE)
%K cosmological model (INSPIRE)
%K self-force (INSPIRE)
%K dark matter: interaction (INSPIRE)
%K galaxy: halo (INSPIRE)
%K numerical calculations (INSPIRE)
%K astroparticle physics (autogen)
%K methods: numerical (autogen)
%K galaxies: haloes (autogen)
%K dark matter (autogen)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:001187239400017
%R 10.1093/mnras/stae699
%U https://bib-pubdb1.desy.de/record/611515