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Title: Probing quintessence potential with future cosmological surveys

Quintessence, a scalar field model, has been proposed to account for the acceleration of the Universe at present. We discuss how accurately quintessence models are discriminated by future cosmological surveys, which include experiments of CMB, galaxy clustering, weak lensing, and the type Ia SNe surveys, by making use of the conventional parameterized dark energy models. We can see clear differences between the thawing and the freezing quintessence models at more than 1σ (2σ) confidence level as long as the present equation of state for quintessence is away from -1 as w{sub X}∼>−0.95(−0.90). However, it is found to be difficult to probe the effective mass squared for the potential in thawing models, whose signs are different between the quadratic and the cosine-type potentials. This fact may require us to invent a new estimator to distinguish quintessence models beyond the thawing and the freezing ones.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Department of Physics and Astrophysics, Nagoya University, Nagoya 464-8602 (Japan)
  2. Kobayashi-Maskawa Institute for the origin of particles and the universe, Nagoya University, Nagoya 464-8602 (Japan)
  3. Department of Physics, Saga University, Saga 840-8502 (Japan)
  4. Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551 (Japan)
Publication Date:
OSTI Identifier:
22370608
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 03; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; EFFECTIVE MASS; EQUATIONS OF STATE; FREEZING; NONLUMINOUS MATTER; POTENTIALS; PROBES; SCALAR FIELDS; THAWING; UNIVERSE