Constraining dark energy using observational growth rate data

Abstract

Observational growth rate data had been derived from observations of redshift distortions in galaxy redshift surveys. Here we use the growth rate data to place constraints on the dark energy model parameters. By performing a joint analysis with the Type Ia supernova, baryon acoustic oscillation and cosmic microwave background data, it is found that the growth rate data are useful for improving the constraints. The joint constraints show that the $\Lambda$CDM model is still in good agreement with current observations, although a time-variant dark energy still cannot be ruled out. It is argued that the growth rate data are helpful for understanding the dark energy. With more accurate data available in the future, we will have a powerful tool for constraining the cosmological and dark energy parameters.

28 pages, 7 figures, accepted for publication in Physics Letters B

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Cited by in corpus (5)

• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: On the measurement of growth rate using galaxy correlation functions
• Gaussian processes reconstruction of dark energy from observational data
• Constraints on a decomposed dark fluid with constant adiabatic sound speed by jointing the geometry test and growth rate after Planck data
• A cosmological exclusion plot: Towards model-independent constraints on modified gravity from current and future growth rate data
• Perspectives for studying the dark energy at z>2 with galaxy surveys