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Cosmological simulations with rare and frequent dark matter self-interactions

Fischer, Moritz S.; Brüggen, Marcus; Schmidt-Hoberg, Kai; Dolag, Klaus; Kahlhoefer, Felix 1; Ragagnin, Antonio; Robertson, Andrew
1 Institut für Theoretische Teilchenphysik (TTP), Karlsruher Institut für Technologie (KIT)

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. ... mehr


Volltext §
DOI: 10.5445/IR/1000151611
Veröffentlicht am 19.10.2022
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Theoretische Teilchenphysik (TTP)
Publikationstyp Forschungsbericht/Preprint
Publikationsjahr 2022
Sprache Englisch
Identifikator KITopen-ID: 1000151611
Umfang 13 S.
Schlagwörter Cosmology and Nongalactic Astrophysics; Astrophysics of Galaxies; High Energy Physics - Phenomenology
Nachgewiesen in arXiv
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