Journal Article

Non-linear evolution of cosmological structures in warm dark matter models

Aurel Schneider, Robert E. Smith, Andrea V. Macciò and Ben Moore

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 424, issue 1, pages 684-698
Published in print July 2012 | ISSN: 0035-8711
Published online July 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21252.x
Non-linear evolution of cosmological structures in warm dark matter models

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The dark energy dominated warm dark matter (WDM) model is a promising alternative cosmological scenario. We explore large-scale structure formation in this paradigm. We do this in two different ways: with the halo model approach and with the help of an ensemble of high-resolution N-body simulations. Combining these quasi-independent approaches leads to a physical understanding of the important processes which shape the formation of structures. We take a detailed look at the halo mass function, the concentrations and the linear halo bias of WDM. In all cases we find interesting deviations with respect to cold dark matter (CDM). In particular, the concentration–mass relation displays a turnover for group scale dark matter haloes, for the case of WDM particles with masses of the order of mWDM∼ 0.25 keV. This may be interpreted as a hint for top–down structure formation on small scales. We implement our results into the halo model and find much better agreement with simulations. On small scales, the WDM halo model now performs as well as its CDM counterpart.

Keywords: cosmology: theory; dark matter; large-scale structure of Universe

Journal Article.  9947 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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