Projected constraints on modified gravity cosmologies from 21 cm intensity mapping

Journal Article · Mon Mar 15 00:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.062001· OSTI ID:21413401

Masui, Kiyoshi Wesley ^[1]; Schmidt, Fabian ^[2]; Pen, Ue-Li; McDonald, Patrick ^[1]

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1. Canadian Institute for Theoretical Astrophysics, 60 St. George Street Toronto, Ontario, M5S 3H8 (Canada)
2. Theoretical Astrophysics, California Institute of Technology M/C 35 0-17, Pasadena, California 91125-0001 (United States)

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 mx200 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{sub R0}|<9x10{sup -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.

• OSTI ID: 21413401
• Journal Information: Physical Review. D, Particles Fields, Vol. 81, Issue 6; Other Information: DOI: 10.1103/PhysRevD.81.062001; (c) 2010 The American Physical Society; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
COSMOLOGY
CYLINDRICAL CONFIGURATION
EXPANSION
GALAXIES
GRAVITATION
GRAVITATIONAL LENSES
MODIFICATIONS
NONLINEAR PROBLEMS
NONLUMINOUS MATTER
OSCILLATIONS
SPECTRA
STANDARD MODEL
TELESCOPES
CONFIGURATION
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
GRAND UNIFIED THEORY
HADRONS
LENSES
MATHEMATICAL MODELS
MATTER
PARTICLE MODELS
QUANTUM FIELD THEORY
UNIFIED GAUGE MODELS