Constraining warm dark matter with cosmic shear power spectra

Katarina Markovič, Sarah Bridle, Anže Slosar, Jochen Weller

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    We investigate potential constraints from cosmic shear on the dark matter particle mass, assuming all dark matter is made up of light thermal relic particles. Given the theoretical uncertainties involved in making cosmological predictions in such warm dark matter scenarios we use analytical fits to linear warm dark matter power spectra and compare (i) the halo model using a mass function evaluated from these linear power spectra and (ii) an analytical fit to the non-linear evolution of the linear power spectra. We optimistically ignore the competing effect of baryons for this work. We find approach (ii) to be conservative compared to approach (i). We evaluate cosmological constraints using these methods, marginalising over four other cosmological parameters. Using the more conservative method we find that a Euclid-like weak lensing survey together with constraints from the Planck cosmic microwave background mission primary anisotropies could achieve a lower limit on the particle mass of 2.5 keV. © 2011 IOP Publishing Ltd and SISSA.
    Original languageEnglish
    Article number022
    JournalJournal of Cosmology and Astroparticle Physics
    Issue number1
    Publication statusPublished - Jan 2011


    • Cosmological parameters from LSS
    • Dark matter theory
    • Weak gravitational lensing


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