Observational constraints on quintessence models of dark energy

Abstract

Scalar fields aptly describe equation of state of dark energy. The scalar field models were initially proposed to circumvent the fine tuning problem of cosmological constant. However, the model parameters also need a fine tuning of their own and it is important to use different observations to determine these parameters. In this paper, we use a combination of low redshift data to constrain the low redshift evolution of canonical scalar field parameters. For this analysis, we use the Supernova Type Ia observations, the Baryon Acoustic Observations and the Hubble parameter measurement data. We consider scalar field models of the thawing type of two different functional forms of potentials. The constraints on the model parameters are more stringent than those from earlier observations although these datasets do not rule out the models entirely. The parameters which let dark energy dynamics closely emulate that of a cosmological constant are preferred. The constraints on the parameters are suitable priors for further quintessence dark energy studies.

arXiv comment18 pages, 6 figures, language changes, references added

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• Using quasar X-ray and UV flux measurements to constrain cosmological model parameters
• Do gamma-ray burst measurements provide a useful test of cosmological models?
• Observational constraints on the tilted spatially-flat and the untilted nonflat $\varphi$CDM dynamical dark energy inflation models
• Determining the range of validity of quasar X-ray and UV flux measurements for constraining cosmological model parameters
• Quasar X-ray and UV flux, baryon acoustic oscillation, and Hubble parameter measurement constraints on cosmological model parameters
• Constraints on cosmological parameters from gamma-ray burst peak photon energy and bolometric fluence measurements and other data
• Constraints on barotropic dark energy models by a new phenomenological $q(z)$ parameterization
• Using SPTpol, Planck 2015, and non-CMB data to constrain tilted spatially-flat and untilted non-flat $\Lambda$CDM, XCDM, and $\varphi$CDM dark energy inflation cosmologies
• Cosmological constraints from HII starburst galaxy apparent magnitude and other cosmological measurements
• Cosmological constraints from higher-redshift gamma-ray burst, HII starburst galaxy, and quasar (and other) data
• Cosmological constraints from HII starburst galaxy, quasar angular size, and other measurements
• Observational constraints and predictions of the interacting dark sector with field-fluid mapping
• Do reverberation-measured H$\beta$ quasars provide a useful test of cosmology?
• Reconstruction of late-time cosmology using Principal Component Analysis
• First study of reionization in tilted flat and untilted non-flat dynamical dark energy inflation models
• Cosmic acceleration and de Sitter expansion in hybrid mass varying neutrino model
• Dynamical system analysis of quintessence dark energy model