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research article

Lyman-alpha constraints on warm and on warm-plus-cold dark matter models

Boyarsky, Alexey
•
Lesgourgues, Julien  
•
Ruchayskiy, Oleg  
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2008
Journal of Cosmology and Astroparticle Physics

We revisit Lyman-alpha bounds on the dark matter mass in Lambda Warm Dark Matter (Lambda-WDM) models, and derive new bounds in the case of mixed Cold plus Warm models (Lambda-CWDM), using a set up which is a good approximation for several theoretically well-motivated dark matter models. We combine WMAP5 results with two different Lyman-alpha data sets, including observations from the Sloan Digital Sky Survey. We pay a special attention to systematics, test various possible sources of error, and compare the results of different statistical approaches. Expressed in terms of the mass of a non-resonantly produced sterile neutrino, our bounds read m_NRP > 8 keV (frequentist 99.7% confidence limit) or m_NRP > 12.1 keV (Bayesian 95% credible interval) in the pure Lambda-WDM limit. For the mixed model, we obtain limits on the mass as a function of the warm dark matter fraction F_WDM. Within the mass range studied here (5 keV < m_NRP < infinity), we find that any mass value is allowed when F_WDM < 0.6 (frequentist 99.7% confidence limit); similarly, the Bayesian joint probability on (F_WDM, 1/m_NRP) allows any value of the mass at the 95% confidence level, provided that F_WDM < 0.35.

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Type
research article
DOI
10.1088/1475-7516/2009/05/012
Author(s)
Boyarsky, Alexey
Lesgourgues, Julien  
Ruchayskiy, Oleg  
Viel, Matteo
Date Issued

2008

Published in
Journal of Cosmology and Astroparticle Physics
Volume

2009

Issue

5

Start page

012

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPPC  
Available on Infoscience
August 6, 2012
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/84449
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