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Astrophysics from the 21-cm background

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arxiv 1909.12595 v1 pith:BS32ELD4 submitted 2019-09-27 astro-ph.CO

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keywords astrophysicsbackgroundionizationwillbeginbriefchapterchemistry
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This chapter describes the astrophysics encoded by the 21-cm background. We begin with a brief introduction to the radiative transfer and ionization chemistry relevant to the high-z intergalactic medium. Then, we will provide a review of the most plausible sources of ionization and heating in the early Universe. Finally, we will explore a variety of current 21-cm predictions, and illustrate the sensitivity of the global 21-cm signal and power spectrum to parameters of interest.

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  1. Forecast on $f(R)$ Gravity with HI 21cm Intensity Mapping Surveys

    astro-ph.CO 2026-02 conditional novelty 4.0 of 10

    Fisher forecasts show BINGO and SKA1-MID 21-cm intensity mapping, combined with Planck priors, could constrain the f(R) gravity parameter B0 down to ~10⁻⁶–10⁻⁸.

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