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@ARTICLE{Fischer:477165,
      author       = {Fischer, Moritz S. and Brüggen, Marcus and Schmidt-Hoberg,
                      Kai and Dolag, Klaus and Kahlhoefer, Felix and Ragagnin,
                      Antonio and Robertson, Andrew},
      title        = {{C}osmological simulations with rare and frequent dark
                      matter self-interactions},
      reportid     = {PUBDB-2022-01926, DESY-22-072. arXiv:2205.02243},
      year         = {2022},
      note         = {13 pages, 16 figures + appendices, submitted to MNRAS},
      abstract     = {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.},
      keywords     = {dark matter, density (INSPIRE) / scattering, small-angle
                      (INSPIRE) / dark matter, halo (INSPIRE) / matter, power
                      spectrum (INSPIRE) / dark matter, scattering (INSPIRE) /
                      halo, density (INSPIRE) / satellite (INSPIRE) / wide-angle
                      (INSPIRE) / correlation function (INSPIRE) / suppression
                      (INSPIRE) / cosmological model (INSPIRE)},
      cin          = {T},
      cid          = {I:(DE-H253)T-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611) / EXC
                      2121 - Das Quantisierte Universum (390833306)},
      pid          = {G:(DE-HGF)POF4-611 / G:(GEPRIS)390833306},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2205.02243},
      howpublished = {arXiv:2205.02243},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2205.02243;\%\%$},
      doi          = {10.3204/PUBDB-2022-01926},
      url          = {https://bib-pubdb1.desy.de/record/477165},
}