Projected Constraints on Modified Gravity Cosmologies from 21 cm Intensity Mapping

Abstract

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 BAO and weak lensing, two of the most powerful cosmological probes. It is found that a 200 m x 200 m 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}| < 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.

10 pages, 5 figures, 1 table. Added references and expanded discussion. As resubmitted to Phys. Rev. D, in response to reviewer comments

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• Cosmological parameter forecasts for HI intensity mapping experiments using the angular power spectrum
• Measuring cosmic velocities with 21cm intensity mapping and galaxy redshift survey cross-correlation dipoles
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• Dark Energy from Large-Scale Structure Lensing Information
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• Cosmology with Hu-Sawicki gravity in Palatini Formalism
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• Cross-correlating 21 cm and galaxy surveys: implications for cosmology and astrophysics
• Future dynamics in f(R) theories
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• Beyond $\Lambda$CDM with HI intensity mapping: robustness of cosmological constraints in the presence of astrophysics
• Cosmological Probes of Structure Growth and Tests of Gravity
• Cosmological Consequences of Exponential Gravity in Palatini Formalism
• Observational Consequences of Dark Energy Decay
• A Multi-messenger view of Cosmic Dawn: Conquering the Final Frontier
• Growth of matter perturbations for realistic $F(R)$ models
• Forecasts on Interacting Dark Energy from 21-cm Angular Power Spectrum with BINGO and SKA observations
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