Exploring uncertainties in dark energy constraints using current observational data with Planck 2015 distance priors

Abstract

We present the distance priors that we have derived from the 2015 Planck data, and use these in combination with the latest observational data from Type Ia Supernovae (SNe Ia) and galaxy clustering, to explore the systematic uncertainties in dark energy constraints. We use the Joint Lightcurve Analysis (JLA) set of 740 SNe Ia, galaxy clustering measurements of H(z)s and D_A(z)/s (where s is the sound horizon at the drag epoch) from the Sloan Digital Sky Survey (SDSS) at z=0.35 and z=0.57 (BOSS DR12). We find that the combined dark energy constraints are insensitive to the assumptions made in the galaxy clustering measurements (whether they are for BAO only or marginalized over RSD), which indicates that as the analysis of galaxy clustering data becomes more accurate and robust, the systematic uncertainties are reduced. On the other hand, we find that flux-averaging SNe Ia at z>= 0.5 significantly tightens the dark energy constraints, and excludes a flat universe with a cosmological constant at 68% confidence level, assuming a dark energy equation of state linear in the cosmic scale factor. Flux-averaging has the most significant effect when we allow dark energy density function X(z) to be a free functions given by the cubic spline of its value at z=0, 1/3, 2/3, 1; the measured X(z) deviates from a cosmological constant at more than 95% confidence level for 0.4 < z < 0.7. Since flux-averaging reduces the bias in the SN distance measurements, this may be an indication that we have arrived in the era when the SN distance measurements are limited by systematic uncertainties.

8 pages, 11 figures. Significantly expanded to include different dark energy parametrizations, and BOSS DR12 data. PRD, in press. arXiv admin note: text overlap with arXiv:1304.4514, arXiv:1109.3172; text overlap with arXiv:1310.6109 by other authors

References in corpus (27)

• Dynamics of dark energy
• Dark Energy and the Accelerating Universe
• Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples
• Observational Probes of Cosmic Acceleration
• Wide-Field InfrarRed Survey Telescope-Astrophysics Focused Telescope Assets WFIRST-AFTA 2015 Report
• Supernova Constraints and Systematic Uncertainties from the First 3 Years of the Supernova Legacy Survey
• Dark Energy
• The Physics of Cosmic Acceleration
• Observational Constraints on Dark Energy and Cosmic Curvature
• Correlated Fluctuations in Luminosity Distance and the (Surprising) Importance of Peculiar Motion in Supernova Surveys
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: RSD measurement from the LOS-dependent power spectrum of DR12 BOSS galaxies
• Uncorrelated Measurements of the Cosmic Expansion History and Dark Energy from Supernovae
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: BAO measurement from the LOS-dependent power spectrum of DR12 BOSS galaxies
• Measurements of H(z) and D_A(z) from the Two-Dimensional Two-Point Correlation Function of Sloan Digital Sky Survey Luminous Red Galaxies
• Figure of Merit for Dark Energy Constraints from Current Observational Data
• Differentiating dark energy and modified gravity with galaxy redshift surveys
• The Beginning and Evolution of the Universe
• SPACE: the SPectroscopic All-sky Cosmic Explorer
• Difficulties Distinguishing Dark Energy from Modified Gravity via Redshift Distortions
• Observational signatures of the weak lensing magnification of supernovae
• Tests of General Relativity on Astrophysical Scales
• Planck priors for dark energy surveys
• Lensing and Supernovae: Quantifying The Bias on the Dark Energy Equation of State
• A Comparative Study of Dark Energy Constraints from Current Observational Data
• On using the WMAP distance priors in constraining the time evolving equation of state of dark energy
• Distance Priors from \emph{Planck} 2015 data
• Dark energy, gravitation and supernovae

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