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There can arise ubiquitous ultra-light scalar fields in the Universe, such asthe pseudo-Goldstone bosons from the spontaneous breaking of an approximatesymmetry, which can make a partial contribution to the dark matter and affectthe large scale structure of the Universe. While the properties of thoseultra-light dark matter are heavily model dependent and can vary in a widerange, we develop a model-independent analysis to forecast the constraints ontheir mass and abundance using futuristic but realistic 21 cm observables aswell as CMB fluctuations, including CMB lensing measurements. Avoiding thehighly nonlinear regime, the 21 cm emission line spectra are most sensitive tothe ultra-light dark matter with mass m ~10^{-26} eV for which the precisionattainable on mass and abundance bounds can be of order of a few percent.

Cosmologically probing ultra-light particle dark matter using 21 cm signals