Cosmological constraints from the redshift dependence of the Alcock-Paczynski Effect: dynamical dark energy

Xiao Dong Li, Cristiano G. Sabiu, Changbom Park, Yuting Wang, Gong Bo Zhao, Hyunbae Park, Arman Shafieloo, Juhan Kim, Sungwook E. Hong

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Abstract

We perform an anisotropic clustering analysis of 1,133,326 galaxies from the Sloan Digital Sky Survey (SDSS-III) Baryon Oscillation Spectroscopic Survey Data Release 12 covering the redshift range 0.15 < z < 0.69. The geometrical distortions of the galaxy positions, caused by incorrect assumptions in the cosmological model, are captured in the anisotropic two-point correlation function on scales of 6-40 h -1 Mpc. The redshift evolution of this anisotropic clustering is used to place constraints on the cosmological parameters. We improve the methodology of Li et al. to enable efficient exploration of high-dimensional cosmological parameter spaces, and apply it to the Chevallier-Polarski-Linder parameterization of dark energy, w = w 0 + w a z/(1 + z). In combination with data on the cosmic microwave background, baryon acoustic oscillations, Type Ia supernovae, and H 0 from Cepheids, we obtain Ωm = 0.301 ±0.008, w 0 = -1.042 ±0.067, and w a = -0.07 ±0.29 (68.3% CL). Adding our new Alcock-Paczynski measurements to the aforementioned results reduces the error bars by ∼30%-40% and improves the dark-energy figure of merit by a factor of ∼2. We check the robustness of the results using realistic mock galaxy catalogs.

Original languageEnglish
Article number88
JournalAstrophysical Journal
Volume856
Issue number2
DOIs
Publication statusPublished - 28 Mar 2018

Keywords

  • cosmological parameters
  • dark energy
  • large-scale structure of universe

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