Probing Quintessence Potential with Future Cosmological Surveys

Abstract

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 $1\sigma$ ($2\sigma$) confidence level as long as the present equation of state for quintessence is away from $-1$ as $w_X\gtrsim -0.95(-0.90)$. 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.

36 pages, 10 figures, 6 tables, minor changes to the footnote and figures; published in JCAP

References in corpus (8)

• Cosmology and the Fate of Dilatation Symmetry
• Optimal Surveys for Weak Lensing Tomography
• Hilltop Quintessence
• Measuring the Speed of Dark: Detecting Dark Energy Perturbations
• Using BBN in cosmological parameter extraction from CMB: a forecast for Planck
• Measuring deviations from a cosmological constant: a field-space parameterization
• Planck priors for dark energy surveys
• Constraints on Generalized Dark Energy from Recent Observations

Cited by in corpus (4)

• Updated observational constraints on quintessence dark energy models
• Bound Dark Energy: towards understanding the nature of the Dark Energy
• Elucidating Dark Energy with Future 21 cm Observations at the Epoch of Reionization
• Reconstructing thawing quintessence with multiple datasets