We present constraints on the mass of warm dark matter (WDM) particles from a combined analysis of the matter power spectrum inferred from the Sloan Digital Sky Survey Lyman-α flux power spectrum at 2.2<z<4.2, cosmic microwave background data, and the galaxy power spectrum. We obtain a lower limit of mWDM≳10keV (2σ) if the WDM consists of sterile neutrinos and mWDM≳2keV (2σ) for early decoupled thermal relics. If we combine this bound with the constraint derived from x-ray flux observations of the Coma cluster, we find that the allowed sterile neutrino mass is ˜10keV (in the standard production scenario). Adding constraints based on x-ray fluxes from the Andromeda galaxy, we find that dark matter particles cannot be sterile neutrinos, unless they are produced by a nonstandard mechanism (resonant oscillations, coupling with the inflaton) or get diluted by a large entropy release.
Can sterile neutrinos be ruled out as Warm Dark Matter candidates? / Viel, Matteo; Lesgourgues, J; Haehnelt, M. G.; Matarrese, S.; Riotto, A.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 97:7(2006), pp. 1-4. [10.1103/PhysRevLett.97.071301]
Can sterile neutrinos be ruled out as Warm Dark Matter candidates?
Viel, Matteo;
2006-01-01
Abstract
We present constraints on the mass of warm dark matter (WDM) particles from a combined analysis of the matter power spectrum inferred from the Sloan Digital Sky Survey Lyman-α flux power spectrum at 2.2File | Dimensione | Formato | |
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