How cold is cold dark matter? Small scales constraints from the flux power spectrum of the high-redshift Lyman-alpha forest

Details How cold is cold dark matter? Small scales constraints from the flux power spectrum of the high-redshift Lyman-alpha forest How cold is cold dark matter? Small scales constraints from the flux power spectrum of the high-redshift Lyman-alpha forest

2007-09-02

arxiv.org/abs/0709.0131v2

Phys.Rev.Lett.100:041304,2008

Astronomy and Astrophysics

Astrophysics

Some issues clarified (especially resolution related). Conclusions unchanged. Accepted version by PRL

Scientific paper

10.1103/PhysRevLett.100.041304

We present constraints on the mass of warm dark matter (WDM) particles derived from the Lyman-alpha flux power spectrum of 55 high- resolution HIRES spectra at 2.0 < z < 6.4. From the HIRES spectra, we obtain a lower limit of mwdm > 1.2 keV 2 sigma if the WDM consists of early decoupled thermal relics and mwdm > 5.6 keV (2 sigma) for sterile neutrinos. Adding the Sloan Digital Sky Survey Lyman-alpha flux power spectrum, we get mwdm > 4 keV and mwdm > 28 keV (2 sigma) for thermal relics and sterile neutrinos. These results improve previous constraints by a factor two.

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