Change search
ReferencesLink to record
Permanent link

Direct link
Anisotropic dark matter distribution functions and impact on WIMP direct detection
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Max Planck Society, Germany.
2013 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, no 12, 050- p.Article in journal (Refereed) Published
Abstract [en]

Dark matter N-body simulations suggest that the velocity distribution of dark matter is anisotropic. In this work we employ a mass model for the Milky Way whose parameters are determined from a fit to kinematical data. Then we adopt an ansatz for the dark matter phase space distribution which allows to construct self-consistent halo models which feature a degree of anisotropy as a function of the radius such as suggested by the simulations. The resulting velocity distributions are then used for an analysis of current data from dark matter direct detection experiments. We find that velocity distributions which are radially biased at large galactocentric distances (up to the virial radius) lead to an increased high velocity tail of the local dark matter distribution. This affects the interpretation of data from direct detection experiments, especially for dark matter masses around 10 GeV, since in this region the high velocity tail is sampled. We find that the allowed regions in the dark matter mass-cross section plane as indicated by possible hints for a dark matter signal reported by several experiments as well as conflicting exclusion limits from other experiments shift in a similar way when the halo model is varied. Hence, it is not possible to improve the consistency of the data by referring to anisotropic halo models of the type considered in this work.

Place, publisher, year, edition, pages
2013. no 12, 050- p.
Keyword [en]
dark matter simulations, dark matter experiments, rotation curves of galaxies, dark energy theory
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-100669DOI: 10.1088/1475-7516/2013/12/050ISI: 000329609000049OAI: diva2:695967


Available from: 2014-02-12 Created: 2014-02-10 Last updated: 2014-10-22Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Schwetz, Thomas
By organisation
Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
In the same journal
Journal of Cosmology and Astroparticle Physics
Astronomy, Astrophysics and Cosmology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 23 hits
ReferencesLink to record
Permanent link

Direct link