TY  - JOUR
AU  - Fischer, Moritz S.
AU  - Kasselmann, Lenard
AU  - Brüggen, Marcus
AU  - Dolag, Klaus
AU  - Kahlhoefer, Felix
AU  - Ragagnin, Antonio
AU  - Robertson, Andrew
AU  - Schmidt-Hoberg, Kai
TI  - Cosmological and idealized simulations of dark matter haloes with velocity-dependent, rare and frequent self-interactions
JO  - Monthly notices of the Royal Astronomical Society
VL  - 529
IS  - 3
SN  - 0035-8711
CY  - Oxford
PB  - Oxford Univ. Press
M1  - PUBDB-2024-04952
M1  - arXiv:2310.07750
M1  - DESY-23-154
SP  - 2327-2348
PY  - 2024
N1  - 17 pages, 15 figures + appendices, accepted for publication in MNRAS
AB  - 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.
KW  - dark matter: halo (INSPIRE)
KW  - mass: scale (INSPIRE)
KW  - dark matter: scattering (INSPIRE)
KW  - differential cross section: angular dependence (INSPIRE)
KW  - velocity dependence (INSPIRE)
KW  - satellite (INSPIRE)
KW  - dark matter: density (INSPIRE)
KW  - collapse (INSPIRE)
KW  - formation (INSPIRE)
KW  - rotation (INSPIRE)
KW  - cosmological model (INSPIRE)
KW  - self-force (INSPIRE)
KW  - dark matter: interaction (INSPIRE)
KW  - galaxy: halo (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:001187239400017
DO  - DOI:10.1093/mnras/stae699
UR  - https://bib-pubdb1.desy.de/record/611515
ER  -