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

Aurel Schneider, Robert E. Smith, Andrea Maccio, Ben Moore

    Research output: Contribution to journalArticle

    Abstract

    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 m WDM∼ 0.25keV. 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.

    Original languageEnglish (US)
    Pages (from-to)684-698
    Number of pages15
    JournalMonthly Notices of the Royal Astronomical Society
    Volume424
    Issue number1
    DOIs
    StatePublished - Jul 1 2012

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    dark matter
    halos
    dark energy
    simulation
    turnover
    deviation
    high resolution
    energy

    Keywords

    • Cosmology: theory
    • Dark matter
    • Large-scale structure of Universe

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Non-linear evolution of cosmological structures in warm dark matter models. / Schneider, Aurel; Smith, Robert E.; Maccio, Andrea; Moore, Ben.

    In: Monthly Notices of the Royal Astronomical Society, Vol. 424, No. 1, 01.07.2012, p. 684-698.

    Research output: Contribution to journalArticle

    Schneider, Aurel ; Smith, Robert E. ; Maccio, Andrea ; Moore, Ben. / Non-linear evolution of cosmological structures in warm dark matter models. In: Monthly Notices of the Royal Astronomical Society. 2012 ; Vol. 424, No. 1. pp. 684-698.
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