\begin{document}$ 0.1\, \tau_U $\end{document}, where \begin{document}$ \tau_U $\end{document} is the age of the universe. Our model provides a viable realization of the millicharged dark matter model to explain the EDGES 21 cm signal, since the minimal model in which the relic density is generated via thermal freeze-out has been ruled out by various constraints."> Two-component millicharged dark matter and the EDGES 21 cm signal -
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