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How Cold Is Cold Dark Matter? Small-Scales Constraints from the Flux Power Spectrum of the High-Redshift Lyman-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>Forest
We present constraints on the mass of warm dark matter (WDM) particles derived from the Lyman-$\ensuremath{\alpha}$ 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 ${m}_{\mathrm{WDM}}\ensuremath{\gtrsim}1.2\text{ }\text{ }\mathrm{keV}$ ($2\ensuremath{\sigma}$) if the WDM consists of early decoupled thermal relics and …