Nonthermal dark matter produced relativistically in an early matter-dominated era remains mostly relativistic at reheating, so free streaming suppresses small-scale structure and Lyman-alpha plus Milky Way satellite data bound its production velocity.
(29) The above equation gives the scale at which the power spectrum of our model begins to differ from that of the standard ΛCDM power spectrum
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Constraining Nonthermal Dark Matter's Impact on the Matter Power Spectrum
Nonthermal dark matter produced relativistically in an early matter-dominated era remains mostly relativistic at reheating, so free streaming suppresses small-scale structure and Lyman-alpha plus Milky Way satellite data bound its production velocity.