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- W4387156676 abstract "We explore the prospects of upcoming 21-cm surveys of cosmic dawn ($12lesssim !zlesssim!30$) 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 $N_{rm eff}$ 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 $2sigma$ level achieving $2sigma(N_{rm eff})=0.034$ with CMB-S4, for example. Taking into account the degeneracy between $N_{rm eff}$ and primordial helium fraction $Y_p$, one can achieve improvements in sensitivities to cosmological parameters, in particular, by more than a factor of 2 for $N_{rm eff}$ and dark matter fractional energy density $omega_c$." @default.
- W4387156676 created "2023-09-30" @default.
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- W4387156676 date "2023-09-26" @default.
- W4387156676 modified "2023-09-30" @default.
- W4387156676 title "Probing light relics through cosmic dawn" @default.
- W4387156676 doi "https://doi.org/10.48550/arxiv.2309.15119" @default.
- W4387156676 hasPublicationYear "2023" @default.
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