Cited by 60Cosmology and Gravitation TheoriesGalaxies: Formation, Evolution, PhenomenaDark Matter and Cosmic Phenomena

Cosmic tomographies: baryon acoustic oscillations and weak lensing

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Zhan, Hu·2006·Journal of Cosmology and Astroparticle Physics

Abstract

We explore the complementarity between two tomographic probes of the universe: baryon acoustic oscillations (in the galaxy power spectrum) and weak gravitational lensing. The galaxy power spectrum characterizes the density fluctuations, whereas the weak lensing shear power spectrum is a direct measure of the potential fluctuations. We find that photometric measurements of baryon oscillations alone do not provide very tight constraints on the dark energy equation of state parameters, partially due to our uncertain knowledge of the galaxy clustering bias. Weak lensing, on the other hand, is adversely impacted by the uncertainties of the probability distribution of photometric redshift errors. A joint analysis of the two, however, is more robust to these uncertainties and leads to a remarkable improvement over the results from either probe alone. Forecasts of cosmological constraints with baryon oscillations and weak lensing are provided for four proposed multiband imaging surveys in combination with measurements of the cosmic microwave background from Planck . In particular, we find that the joint analysis of galaxy and shear power spectra with the Large Synoptic Survey Telescope can tighten the 1σ error bounds on the dark energy equation of state (at the pivot expansion factor a p = 0.63) and its rate of change, respectively, to 0.016 and 0.16 (marginalized over 131 other parameters). With supernovae and cluster counting as well as higher-order statistics of the same galaxy and shear data, one can further improve the constraints.

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Crossref · 10.1088/1475-7516/2006/08/008

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  • With CMB fluctuations as normalization, combining these probes can achieve the precision needed to distinguish dark energy models.

    “Using the cosmic microwave background ( CMB ) fl uctuations as the normalization, the combination of these probes can yield the needed precision to distinguish among models of dark energy”

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Authors
Zhan, H.
Affiliations
University of California, Davis (US)
Corresponding author
Zhan, Hu
Venue
Journal of Cosmology and Astroparticle Physics
Published
2006-08-24
Volume
2006
Issue
08
Pages
008-008
ISSN
  • 1475-7508 (ISSN-L)
  • 1475-7516
OpenAlex
W2140590388
Cited by
60
References
106
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2023: 1 · 2022: 2 · 2020: 1 · 2019: 3 · 2016: 7 · 2014: 6 · 2013: 2 · 2012: 4
FWCI
4.60
Type
journal article
Language
en
Open access
Locations
  • Journal of Cosmology and Astroparticle Physics (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
  • Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Dark Matter and Cosmic Phenomena
Keywords
baryon acoustic oscillations, weak gravitational lensing, dark energy equation of state, galaxy power spectrum, photometric redshift errors, LSST, Planck CMB constraints, cosmological parameter forecasts

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