Probing the Epoch of Early Baryonic Infall Through 21cm Fluctuations

Details Probing the Epoch of Early Baryonic Infall Through 21cm Fluctuations Probing the Epoch of Early Baryonic Infall Through 21cm Fluctuations

2005-02-03

arxiv.org/abs/astro-ph/0502083v2

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures, MNRAS Letters, accepted

Scientific paper

10.1111/j.1745-3933.2005.00079.x

After cosmological recombination, the primordial hydrogen gas decoupled from the cosmic microwave background (CMB) and fell into the gravitational potential wells of the dark matter. The neutral hydrogen imprinted acoustic oscillations on the pattern of brightness fluctuations due to its redshifted 21cm absorption of the CMB. Unlike CMB temperature fluctuations which probe the power spectrum at cosmic recombination, we show that observations of the 21cm fluctuations at z ~ 20-200 can measure four separate fluctuation modes (with a fifth mode requiring very high precision), thus providing a unique probe of the geometry and composition of the universe.

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