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The galactic halo in mixed dark matter cosmologies


Anderhalden, D; Diemand, J; Bertone, G; Macciò, A V; Schneider, A (2012). The galactic halo in mixed dark matter cosmologies. Journal of Cosmology and Astroparticle Physics, 2012:10047.

Abstract

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 (bar 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 = bar fW). Here we find however, that the normalised local WDM fraction (fW,odot / bar fW) 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.

Abstract

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 (bar 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 = bar fW). Here we find however, that the normalised local WDM fraction (fW,odot / bar fW) 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.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:2012
Deposited On:05 Mar 2013 11:32
Last Modified:07 Dec 2017 18:09
Publisher:IOP Publishing
ISSN:1475-7516
Publisher DOI:https://doi.org/10.1088/1475-7516/2012/10/047

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