First constraints on fuzzy dark matter from Lyman-alpha forest data and hydrodynamical simulations

Irsic, Vid and Viel, Matteo and Haehnelt, Martin G. and Bolton, James S. and Becker, George D. (2017) First constraints on fuzzy dark matter from Lyman-alpha forest data and hydrodynamical simulations. Physical Review Letters, 119 (3). 031302/1-031302/7. ISSN 1079-7114

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Abstract

We present constraints on the masses of extremely light bosons dubbed fuzzy dark matter from Lyman- α forest data. Extremely light bosons with a De Broglie wavelength of ~ 1 kpc have been suggested as dark matter candidates that may resolve some of the current small scale problems of the cold dark matter model. For the first time we use hydrodynamical simulations to model the Lyman- α flux power spectrum in these models and compare with the observed flux power spectrum from two different data sets: the XQ-100 and HIRES/MIKE quasar spectra samples. After marginalization over nuisance and physical parameters and with conservative assumptions for the thermal history of the IGM that allow for jumps in the temperature of up to 5000 K, XQ-100 provides a lower limit of 7.1 x 10 -22 eV, HIRES/MIKE returns a stronger limit of 14.3 x 10 -22 eV, while the combination of both data sets results in a limit of 20 x 10 -22 eV (2σ C.L.). The limits for the analysis of the combined data sets increases to 37.5 x 10 -22 eV (2σ C.L.) when a smoother thermal history is assumed where the temperature of the IGM evolves as a power-law in redshift. Light boson masses in the range 1 - 10 x 10 -22 eV are ruled out at high significance by our analysis, casting strong doubts on suggestions of significant strophysical implications of FDM, in particular for solving the "small scale crisis" of cold dark matter models

Item Type: Article
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1103/PhysRevLett.119.031302
Depositing User: Bolton, James
Date Deposited: 12 Jul 2017 08:06
Last Modified: 18 Aug 2017 10:24
URI: http://eprints.nottingham.ac.uk/id/eprint/44069

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