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The EDGES experiment has observed an excess trough ($-500^{+200}_{-500}$ mK)in the brightness temperature $T_{21}$ of the 21cm absorption line of neutralHydrogen atom (HI) from the era of cosmic dawn ($z \simeq 17.2$). We considerpossible interaction of Dark Matter and Dark Energy fluid along with thecooling off of the baryon matter by its collision with Dark Matter to explainthe observed excess trough of $T_{21}$. We make use of three different DarkMatter-Dark Energy (DM-DE) interaction models to taste the viability of thosemodels in explaining the EDGES results. The evolution of Hubble parameter ismodified by DM-DE interactions and this is also addressed in this work. This inturn influences the optical depth of HI 21cm as well as the baryon temperatureand thus effects the $T_{21}$ brightness temperature. In addition we also findthat the DM-DE interaction enables us to explore Dark Matter with varied massregimes and their viabilities in terms of satisfying the EDGES result.

Probing Interacting Dark Energy and Scattering of Baryons with Dark Matter in Light of EDGES 21cm Signal