تقرير
Cosmological simulations with rare and frequent dark matter self-interactions
| العنوان: | Cosmological simulations with rare and frequent dark matter self-interactions |
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| المؤلفون: | Fischer, Moritz S., Brüggen, Marcus, Schmidt-Hoberg, Kai, Dolag, Klaus, Kahlhoefer, Felix, Ragagnin, Antonio, Robertson, Andrew |
| سنة النشر: | 2022 |
| المجموعة: | Astrophysics High Energy Physics - Phenomenology |
| مصطلحات موضوعية: | Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Astrophysics of Galaxies, High Energy Physics - Phenomenology |
| الوصف: | 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. Comment: 13 pages, 16 figures + appendices, accepted for publication in MNRAS |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1093/mnras/stac2207 |
| URL الوصول: | http://arxiv.org/abs/2205.02243 |
| رقم الأكسشن: | edsarx.2205.02243 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1093/mnras/stac2207 |
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