|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'500'096
Articles rated: 2609
18 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Constraining self-interacting dark matter with scaling laws of observed halo surface densities | | Kyrylo Bondarenko
; Alexey Boyarsky
; Torsten Bringmann
; Anastasia Sokolenko
; | | Date: |
18 Dec 2017 | | Abstract: | The observed surface densities of dark matter halos are known to follow a
simple scaling law, ranging from dwarf galaxies to galaxy clusters, with a weak
dependence on their virial mass. Here we point out that this can not only be
used to provide a method to determine the standard relation between halo mass
and concentration, but also to use large samples of objects in order to place
constraints on dark matter self-interactions that can be more robust than
constraints derived from individual objects. We demonstrate our method by
considering a sample of about 50 objects distributed across the whole halo mass
range. Modelling the effect of self-interactions in a way similar to what has
been previously used in the literature, we derive a constraint on the
self-interaction cross section per unit dark matter mass of about
$sigma/m_chilesssim 0.2$,cm$^2$/g. Formally, this is already somewhat
smaller than the range $0.5-5$,cm$^2$/g that has been invoked to explain
potential inconsistencies between small-scale observations and expectations in
the standard collisionless cold dark matter paradigm. We expect that these
constraints can be significantly improved in the future, and made more robust,
by i) an improved theoretical modelling of the effect of self-interactions, ii)
taking into account a larger sample of objects and iii) by reducing the
currently still relatively large uncertainties that we conservatively assign to
the surface densities of individual objects. The latter can be achieved in
particular by using kinematic observations to directly constrain the average
halo density inside a given radius, rather than fitting the data to a
pre-selected profile and then reconstruct the profile. | | Source: | arXiv, 1712.6602 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER