Preprint

PUBDB-2022-01926

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Cosmological simulations with rare and frequent dark matter self-interactions

Fischer, M. S. (Corresponding author) ; Brüggen, M. ; Schmidt-Hoberg, K.DESY* ; Dolag, K. ; Kahlhoefer, F. ; Ragagnin, A. ; Robertson, A.

2022

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Please use a persistent id in citations: doi:10.3204/PUBDB-2022-01926

Report No.: DESY-22-072; arXiv:2205.02243

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.

Keyword(s): dark matter, density ; scattering, small-angle ; dark matter, halo ; matter, power spectrum ; dark matter, scattering ; halo, density ; satellite ; wide-angle ; correlation function ; suppression ; cosmological model

Note: 13 pages, 16 figures + appendices, submitted to MNRAS

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. EXC 2121 - Das Quantisierte Universum (390833306) (390833306)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2022

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Database coverage:
; ; Published

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article Fischer, M. S. (Corresponding author) ; Brüggen, M. ; Schmidt-Hoberg, K.DESY* ; Dolag, K. ; Kahlhoefer, F. ; Ragagnin, A. ; Robertson, A.
Cosmological simulations with rare and frequent dark matter self-interactions
Monthly notices of the Royal Astronomical Society 516(2), 1923 - 1940 (2022) [10.1093/mnras/stac2207]2022     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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