Published January 29, 2008
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How Cold Is Cold Dark Matter? Small-Scales Constraints from the Flux Power Spectrum of the High-Redshift Lyman-alpha Forest
Abstract
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 2.0~1.2 keV (2sigma) if the WDM consists of early decoupled thermal relics and mWDM>~5.6 keV (2sigma) for sterile neutrinos. Adding the Sloan Digital Sky Survey Lyman-alpha flux power spectrum, we get mWDM>~4 keV and mWDM>~28 keV (2sigma) for thermal relics and sterile neutrinos. These results improve previous constraints by a factor of 2.
Additional Information
©2008 The American Physical Society. Received: 12 August 2007; published: 29 January 2008. Simulations were made at the COSMOS supercomputer (funded by PPARC, HEFCE, SGI, and Intel) and at the HPC center in Cambridge (U.K.) G.D.B., M.R. and W.L.W.S. thank NSF for support under Grants No. AST 05-6845, No. AST-0206067, and no. 0606868. HIRES spectra obtained at the Keck Obs. (supported by Keck Foundation). We thank J. Lesgourgues for comments.Files
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- Eprint ID
- 9547
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- CaltechAUTHORS:VIEprl08
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2008-02-04Created from EPrint's datestamp field
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2021-11-08Created from EPrint's last_modified field