Current cosmological constraints on the curvature, dark energy and modified gravity

Abstract

We apply the Union2 compilation of 557 supernova Ia data, the baryon acoustic oscillation measurement of distance, the cosmic microwave background radiation data from the seven year Wilkinson Microwave Anisotropy Probe, and the Hubble parameter data to study the geometry of the Universe and the property of dark energy by using models and parametrizations with different high redshift behaviours of $w(z)$. We find that $\Lambda$CDM model is consistent with current data, that the Dvali-Gabadadze-Porrati model is excluded by the data at more than $3\sigma$ level, that the Universe is almost flat, and that the current data is unable to distinguish models with different behaviours of $w(z)$ at high redshift. We also add the growth factor data to constrain the growth index of Dvali-Gabadadze-Porrati model and find that it is more than $1\sigma$ away from its theoretical value.

v3: 7 pages, 5 figures, correct typos on the citation of wmap7 data

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Cited by in corpus (8)

• Dark Energy
• Cosmology with hybrid expansion law: scalar field reconstruction of cosmic history and observational constraints
• Reconstruction of the Dark Energy equation of state
• Measurement on the cosmic curvature using the Gaussian process method
• The effect of different observational data on the constraints of cosmological parameters
• Observational constraints on unified dark matter including Hubble parameter data
• On the effect of the degeneracy between w_0 and w_a
• The tension on the cosmological parameters from different observational data