Constraining noncold dark matter models with the global 21-cm signal

Any particle dark matter (DM) scenario featuring a suppressed power spectrum of astrophysical relevance results in a delay of galaxy formation. As a consequence, such scenarios can be constrained using the global 21-cm absorption signal initiated by the UV radiation of the first stars. The Experiment to Detect the Global Epoch of Reionization Signature (EDGES) recently reported the first detection of such an absorption signal at redshift 17. While its amplitude might indicate the need for new physics, we solely focus on the timing of the signal to test noncold DM models. Assuming conservative limits for the stellar-to-baryon fraction (f*10^3 Kelvin) motivated by radiation-hydrodynamic simulations, we are able to derive unprecedented constraints on a variety of noncold DM models. For example, the mass of thermal warm DM is limited to mₓ₇>6. 1 keV, while mixed DM scenarios (featuring a cold and a hot component) are constrained to a hot DM fraction below 17 percent. The ultralight axion DM model is limited to masses m₀>810^-21 eV, a regime where its wave-like nature is pushed far below the kiloparsec scale. Finally, sterile neutrinos from resonant production can be fully disfavored as a dominant DM candidate. The results of this paper show that the 21-cm absorption signal is a powerful discriminant of noncold dark matter, allowing for significant improvements over to the strongest current limits. Confirming the result from EDGES is paramount in this context.