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Fuzzy dark matter (FDM) is a well motivated candidate for dark matter (DM) asits tiny mass and large de-Broglie wavelength suppress small-scale matterfluctuations, thereby solving some of the small-scale discrepancies in$\Lambda$CDM. Although it has been ruled out as the single component of DM byseveral observables, there is still a region in the FDM parameter space (the"FDM window", $10^{-25}\,\mathrm{eV}\lesssimm_\mathrm{FDM}\lesssim10^{-23}\,\mathrm{eV}$) where FDM is allowed to comprisea large portion of the total DM. In this work, for the first time, we study thesignature of FDM (comprised of ultra-light axions) in fractions less than unityon the 21cm signal and its detectability by 21cm interferometers such as HERA,taking into account the degeneracy with both astrophysical and cosmologicalparameters, using a new pipeline that combines modified versions of the CAMBand 21cmFAST codes. Our forecasts imply that HERA in its design performancewill be sensitive to FDM fractions as small as 1% in the FDM window, andimprove over existing bounds for other masses by up to an order of magnitude.

Closing the window on fuzzy dark matter with the 21cm signal