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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

Viel, Matteo and Becker, George D. and Bolton, James S. and Haehnelt, Martin G. and Rauch, Michael and Sargent, Wallace L. (2008) How Cold Is Cold Dark Matter? Small-Scales Constraints from the Flux Power Spectrum of the High-Redshift Lyman-alpha Forest. Physical Review Letters, 100 (4). Art. No. 041304. ISSN 0031-9007. https://resolver.caltech.edu/CaltechAUTHORS:VIEprl08

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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<z<6.4. From the HIRES spectra, we obtain a lower limit of mWDM>~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.


Item Type:Article
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.
Subject Keywords:Dark matter (stellar, interstellar, galactic, and cosmological),Intergalactic matter; quasar absorption and emission-line systems; Lyman forest; Observational cosmology
Issue or Number:4
Record Number:CaltechAUTHORS:VIEprl08
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:VIEprl08
Alternative URL:http://dx.doi.org/10.1103/PhysRevLett.100.041304
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9547
Collection:CaltechAUTHORS
Deposited By: Lindsay Cleary
Deposited On:04 Feb 2008
Last Modified:03 Oct 2019 00:01

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