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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