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A 2 per cent distance to z = 0.35 by reconstructing baryon acoustic oscillations - III. Cosmological measurements and interpretation

Citation:

Mehta KT, Cuesta AJ, Xu X, Eisenstein DJ, Padmanabhan N. A 2 per cent distance to z = 0.35 by reconstructing baryon acoustic oscillations - III. Cosmological measurements and interpretation. Monthly Notices of the Royal Astronomical Society. 2012;427 :2168-2179.

Date Published:

December 1, 2012

Abstract:

We use the 2 per cent distance measurement from our reconstructed baryonacoustic oscillations (BAOs) signature using the Sloan Digital SkySurvey (SDSS) Data Release 7 (DR7) luminous red galaxies fromPadmanabhan et al. and Xu et al. combined with cosmic microwavebackground data from Wilkinson Microwave Anisotropy Probe (WMAP7) tomeasure parameters for various cosmological models. We find a 1.7 percent measurement of H0 = 69.8 ± 1.2 km s-1Mpc-1 and a 5.0 per cent measurement ofΩm=0.280±0.014 for a flat universe with a cosmologicalconstant. These measurements of H0 and Ωmare robust against a range of underlying models for the expansionhistory. We measure the dark energy equation of state parameter w =-0.97 ± 0.17, which is consistent with a cosmological constant.If curvature is allowed to vary, we find that the Universe is consistentwith a flat geometry (ΩK = -0.004 ± 0.005). Wealso use a combination of the 6 Degree Field Galaxy Survey BAO data,WiggleZ Dark Energy Survey data, Type Ia supernovae data and a localmeasurement of the Hubble constant to explore cosmological models withmore parameters. Finally, we explore the effect of varying the energydensity of relativistic particles on the measurement of H0.

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