Constraining dark energy via baryon acoustic oscillations in the (an)isotropic light-cone power spectrum
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Publication:3523886
DOI10.1051/0004-6361:20077688zbMATH Open1144.85309arXiv0705.0354OpenAlexW3100044433WikidataQ68587847 ScholiaQ68587847MaRDI QIDQ3523886
Author name not available (Why is that?)
Publication date: 8 September 2008
Published in: (Search for Journal in Brave)
Abstract: The measurement of the scale of the baryon acoustic oscillations (BAO) in the galaxy power spectrum as a function of redshift is a promising method to constrain the equation-of-state parameter of the dark energy w. To measure the scale of the BAO precisely, a substantial volume of space must be surveyed. We test whether light-cone effects are important and whether the scaling relations used to compensate for an incorrect reference cosmology are in this case sufficiently accurate. We investigate the degeneracies in the cosmological parameters and the benefits of using the two-dimensional anisotropic power spectrum. Finally, we estimate the uncertainty with which w can be measured by proposed surveys at redshifts of about z=3 and z=1, respectively. In the simulated survey we find that light-cone effects are small and that the simple scaling relations used to correct for the cosmological distortion work fairly well even for large survey volumes. The analysis of the two-dimensional anisotropic power spectra enables an independent determination to be made of the apparent scale of the BAO, perpendicular and parallel to the line of sight. This is essential for two-parameter w-models, such as the redshift-dependent dark energy model w=w_0+(1-a)w_a. Using Planck priors for the matter and baryon density and Delta(H_0)=5% for the Hubble constant, we estimate that the BAO measurements of future surveys around z=3 and z=1 will be able to constrain, independently of other cosmological probes, a constant w to ~ 12% and ~ 11% (68% c.l.), respectively.
Full work available at URL: https://arxiv.org/abs/0705.0354
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