Cosmology from the Highly-Redshifted 21 cm Line

Details Cosmology from the Highly-Redshifted 21 cm Line Cosmology from the Highly-Redshifted 21 cm Line

2009-02-18

arxiv.org/abs/0902.3259v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, 5 figures, science white paper submitted to the US Astro2010 Decadal Survey "Cosmology and Fundamental Physics" Scien

Scientific paper

One of the next decade's most exciting prospects is to explore the cosmic "dark ages," during which the first stars in the Universe formed, with the 21 cm line of neutral hydrogen. At z>6, this light redshifts into the low-frequency radio regime and can be observed with new generations of wide-field arrays. These experiments have the potential to observe enormous volumes and to improve both cosmological and astrophysical constraints dramatically. In this white paper, we describe how the next decade will see the first steps toward unlocking this potential, allowing us to answer two key questions about the fundamental physics of our Universe and the intergalactic medium: Does the standard cosmological model describe the Universe during the "dark ages?" How did the intergalactic medium evolve during this important time, ending with the reionization of hydrogen?

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