Journal Article

PUBDB-2022-02948

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
Oxford Univ. Press Oxford

This record in other databases:        

Please use a persistent id in citations: doi:10.1093/mnras/stac2207  doi:10.3204/PUBDB-2022-02948

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 ; dark matter: interaction ; self-force ; two-point function ; numerical calculations ; astroparticle physics ; methods: numerical ; galaxies: haloes ; dark matter

Note: 13 pages, 16 figures + appendices, accepted for publication in MNRAS © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

---

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

---

Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

---

---

Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint 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
[10.3204/PUBDB-2022-01926]     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

---