Possibility of precise measurement of the cosmological power spectrum with a dedicated survey of 21 cm emission after reionization |
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Authors: | Loeb Abraham Wyithe J Stuart B |
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Affiliation: | Astronomy Department, Harvard University, 60 Garden Street, Cambridge, Massachusetts 02138, USA. |
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Abstract: | 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 approximately 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. |
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