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Title: Principal component analysis of modified gravity using weak lensing and peculiar velocity measurements

We perform a principal component analysis to assess ability of future observations to measure departures from General Relativity in predictions of the Poisson and anisotropy equations on linear scales. In particular, we focus on how the measurements of redshift-space distortions (RSD) observed from spectroscopic galaxy redshift surveys will improve the constraints when combined with lensing tomographic surveys. Assuming a Euclid-like galaxy imaging and redshift survey, we find that adding the 3D information decreases the statistical uncertainty by a factor between 3 and 7 compared to the case when only observables from lensing tomographic surveys are used. We also find that the number of well-constrained modes increases by a factor between 3 and 6. Our study indicates the importance of joint galaxy imaging and redshift surveys such as SuMIRe and Euclid to give more stringent tests of the ΛCDM model and to distinguish between various modified gravity and dark energy models.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6]
  1. Department of Physics, Graduate School of Science, Nagoya University, Aichi 464-8602 (Japan)
  2. Kobayashi Maskawa Institute (KMI), Nagoya University, Aichi 464-8602 (Japan)
  3. Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth, PO1 3FX (United Kingdom)
  4. National Astronomy Observatories, Chinese Academy of Science, Beijing, 100012, P.R.China (China)
  5. Institute for the Early Universe, Ewha Womans University, Seoul, 120-750 (Korea, Republic of)
  6. Department of Physics, Simon Fraser University, Burnaby, British Columbia, V5A 1S6 (Canada)
Publication Date:
OSTI Identifier:
22282721
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2013; Journal Issue: 08; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANISOTROPY; COMPARATIVE EVALUATIONS; COSMOLOGICAL CONSTANT; COSMOLOGY; GALAXIES; GENERAL RELATIVITY THEORY; GRAVITATION; NONLUMINOUS MATTER; RED SHIFT; SPACE