The galactic halo in mixed dark matter cosmologies

D. Anderhalden, J. Diemand, G. Bertone, A. V. MacCiò, A. Schneider

Research output: Contribution to journalArticlepeer-review


A possible solution to the small scale problems of the cold dark matter (CDM) scenario is that the dark matter consists of two components, a cold and a warm one. We perform a set of high resolution simulations of the Milky Way halo varying the mass of the WDM particle (mWDM) and the cosmic dark matter mass fraction in the WDM component (W). The scaling ansatz introduced in combined analysis of LHC and astroparticle searches postulates that the relative contribution of each dark matter component is the same locally as on average in the Universe (e.g. fW,ȯ = W). Here we find however, that the normalised local WDM fraction (fW,ȯ / W) depends strongly on mWDM for mWDM < 1 keV. Using the scaling ansatz can therefore introduce significant errors into the interpretation of dark matter searches. To correct this issue a simple formula that fits the local dark matter densities of each component is provided.

Original languageEnglish (US)
Article number047
JournalJournal of Cosmology and Astroparticle Physics
Issue number10
StatePublished - Oct 2012


  • cosmological simulations
  • dark matter theory

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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