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In the fuzzy dark matter (FDM) model, dark matter is composed of ultra-lightparticles with a de Broglie wavelength of $\sim$kpc, above which it behaveslike cold dark matter (CDM). Due to this, FDM suppresses the growth ofstructure on small scales, which delays the onset of the cosmic dawn (CD) andthe subsequent epoch of reionization (EoR). This leaves potential signatures inthe sky averaged 21-cm signal (global), as well as in the 21-cm fluctuations,which can be sought for with ongoing and future 21-cm global and intensitymapping experiments. To do so reliably, it is crucial to include effects suchas the dark-matter/baryon relative velocity and Lyman-Werner star-formationfeedback, which also act as delaying mechanisms, as well as CMB and \lyaheating effects, which can significantly change the amplitude and timing of thesignal, depending on the strength of X-ray heating sourced by the remnants ofthe first stars. Here we model the 21-cm signal in FDM cosmologies across CDand EoR using a modified version of the public code 21cmvFAST that accounts forall these additional effects, and is directly interfaced with the Boltzmanncode CLASS so that degeneracies between cosmological and astrophysicalparameters can be fully explored. We examine the prospects to distinguishbetween the CDM and FDM models and forecast joint astrophysical, cosmologicaland FDM parameter constraints achievable with intensity mapping experimentssuch as HERA and global signal experiments like EDGES. We find that HERA willbe able to detect FDM particle masses up to $m_{\rm FDM}\! \sim\!10^{-19}\,{\rm eV}\!-\!10^{-18}\,{\rm eV}$, depending on foregroundassumptions, despite the mitigating effect of the delaying and heatingmechanisms included in the analysis.

Exploring delaying and heating effects on the 21-cm signature of fuzzy dark matter