Open AccessModel‐independent reconstruction of the expansion history of the Universe and the properties of dark energy
Author(s) -
Shafieloo Arman
Publication year - 2007
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2007.12175.x
Subject(s) - dark energy , physics , baryon acoustic oscillations , deceleration parameter , redshift , equation of state , astrophysics , smoothing , supernova , cosmology , parametrization (atmospheric modeling) , universe , baryon , oscillation (cell signaling) , quantum mechanics , galaxy , statistics , mathematics , radiative transfer , biology , genetics
We have improved upon the method of smoothing supernovae data to reconstruct the expansion history of the Universe, h ( z ), using two latest data sets, Gold and Supernovae Legacy Survey (SNLS). The reconstruction process does not employ any parametrization and is independent of any dark energy model. The reconstructed h ( z ) is used to derive the distance factor A up to redshift 0.35 and the results are compared with the given value of A from detection of the baryon acoustic oscillation peak. We find very good agreement between supernovae observations and the results from the baryon acoustic oscillation peak for Ω 0m ≈ 0.276 ± 0.023 . The estimated values of Ω 0m are completely model‐independent and are only based on observational data. The derived values of Ω 0m are then used to reconstruct the equation of state of dark energy, w ( z ). Using our smoothing method, we can demonstrate that while SNLS data are in very good agreement with Λ cold dark matter (ΛCDM), the Gold sample slightly prefers evolving dark energy. We also show that proper estimation of the equation of state of dark energy at the high redshifts would be impossible at the current status of observations.