The galactic halo in mixed dark matter cosmologies

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 (m sub(WDM)) and the cosmic dar...

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Published inJournal of cosmology and astroparticle physics Vol. 2012; no. 10; pp. i - 19
Main Authors Anderhalden, D, Diemand, J, Bertone, G, Maccio, A V, Schneider, A
Format Journal Article
LanguageEnglish
Published United States 01.10.2012
Subjects
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COMPUTERIZED SIMULATION
COSMOLOGY
Dark matter
DENSITY
Halos
KEV RANGE
MASS
MATHEMATICAL SOLUTIONS
MILKY WAY
NONLUMINOUS MATTER
RESOLUTION
Searching
Simulation
Small scale
SUN
UNIVERSE
Wavelength division multiplexing
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Summary: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 (m sub(WDM)) and the cosmic dark matter mass fraction in the WDM component (fW). 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, [odot] fW). Here we find however, that the normalised local WDM fraction (fW, [odot]/fW) depends strongly on m sub(WDM) for m sub(WDM) < 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.
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ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2012/10/047