Phys. Rev. Lett. 100, 161301 (2008) [4 pages]Possibility of Precise Measurement of the Cosmological Power Spectrum with a Dedicated Survey of 21 cm Emission after ReionizationReceived 10 January 2008; revised 23 February 2008; published 22 April 2008 Measurements of the 21 cm line emission by residual cosmic hydrogen after reionization can be used to trace the power spectrum of density perturbations through a significant fraction of the observable volume of the Universe. We show that a dedicated 21 cm observatory could probe a number of independent modes that is 2 orders of magnitude larger than currently available, and enable a cosmic-variance limited detection of the signature of a neutrino mass ∼0.05 eV. The evolution of the linear growth factor with redshift could also constrain exotic theories of gravity or dark energy to an unprecedented precision. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.161301
DOI:
10.1103/PhysRevLett.100.161301
PACS:
98.80.Es, 95.55.Jz, 95.85.Bh
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