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.
CMB constraints on dark matter phenomenology via reheating in minimal plateau inflation
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We consider the CMB constraints on reheating and dark matter parameter space for a specific plateau type inflationary model. The plateau inflationary models which are currently most favored models from data can be well approximated by a potential of the form $V(\phi)\propto \phi^n$ around $\phi=0$. This fact makes it possible to study the reheating phase with general inflaton equation of state in a viable cosmological scenario. In addition, following our recent work[1], we generalize the connection between reheating and the present CMB data and the dark matter parameter space for general inflaton equation of state parameter.
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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.