Papers › Probing light relics through cosmic dawn
Probing light relics through cosmic dawn
Nanoom Lee, Selim C. Hotinli
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We explore the prospects of upcoming 21-cm surveys of cosmic dawn (12≲z≲30) to provide cosmological information on top of upcoming cosmic microwave background (CMB) and large-scale structure surveys, such as CMB-S4, Simons Observatory (SO) and DESI. We focus on the effective number of relativistic species N_(eff) which is a promising observable for probing beyond the Standard Model theories. We show including upcoming 21-cm surveys such as the Square Kilometre Array (SKA) can allow probing a wide range of models for light particles at 2σ level achieving 2σ(N_(eff))=0.034 with CMB-S4, for example. Taking into account the degeneracy between N_(eff) and primordial helium fraction Yₚ, one can achieve improvements in sensitivities to cosmological parameters, in particular, by more than a factor of 2 for N_(eff) and dark matter fractional energy density ω_c.
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