Masui, Kiyoshi Wesley and Schmidt, Fabian and Pen, Ue-Li and McDonald, Patrick (2010) Projected constraints on modified gravity cosmologies from 21 cm intensity mapping. Physical Review D, 81 (6). Art. No. 062001. ISSN 0556-2821 http://resolver.caltech.edu/CaltechAUTHORS:20100521-091332397
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We present projected constraints on modified gravity models from the observational technique known as 21 cm intensity mapping, where cosmic structure is detected without resolving individual galaxies. The resulting map is sensitive to both baryon acoustic oscillations and weak lensing, two of the most powerful cosmological probes. It is found that a 200 m × 200 m cylindrical telescope, sensitive out to z=2.5, would be able to distinguish Dvali, Gabadadze, and Porrati from most dark energy models, and constrain the Hu and Sawicki f(R) model to |f_(R0)|<9×10^(-6) at 95% confidence. The latter constraint makes extensive use of the lensing spectrum in the nonlinear regime. These results show that 21 cm 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.
|Additional Information:||© 2010 The American Physical Society. Received 18 November 2009; published 11 March 2010. We would like to thank T. Lu for helpful discussions. K.M. is supported by NSERC. F.S. is supported by the Gordon and Betty Moore Foundation at Caltech.|
|Classification Code:||PACS: 04.80.Cc.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||24 May 2010 01:58|
|Last Modified:||26 Dec 2012 12:03|
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