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Title:
Projected Constraints on Modified Gravity Cosmologies from 21cm Intensity Mapping
Authors:
Masui, Kiyoshi Wesley; Schmidt, Fabian; Pen, Ue-Li; McDonald, Patrick
Publication:
eprint arXiv:0911.3552
Publication Date:
11/2009
Origin:
ARXIV
Keywords:
Astrophysics - Cosmology and Extragalactic Astrophysics
Comment:
9 pages, 5 figures, 1 table. To be submitted to Phys. Rev. D
Bibliographic Code:
2009arXiv0911.3552M

Abstract

We present projected constraints on modified gravity models from the observational technique known as 21cm intensity mapping, where cosmic structure is detected without resolving individual galaxies. The resulting map is sensitive to both BAO and weak lensing, two of the most powerful cosmological probes. It is found that a 200m x 200m cylindrical telescope, sensitive out to z=2.5, would be able to distinguish DGP from most dark energy models, and constrain the Hu & Sawicki f(R) model to |f_{R0}| < 9x10^(-6) at 95% confidence. The latter constraint makes extensive use of the lensing spectrum in the nonlinear regime. These results show that 21cm intensity mapping is not only sensitive to modifications of the standard model's expansion history, but also to structure growth. This makes intensity mapping a powerful and economical technique, achievable on much shorter time scales than optical experiments that would probe the same era.
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