Thawing Versus. Tracker Behaviour: Observational Evidence

Abstract

Currently there is a variety of scalar field models to explain the late time acceleration of the Universe. This includes the standard canonical and non-canonical scalar field models together with recently proposed Galileon scalar field models. One can divide all these scalar field models into two broad categories, namely the thawing and the tracker class. In this work we investigate the evidence for these models with the presently available observational data using the Bayesian approach. We use the Generalized Chaplygin Gas (GCG) parametrization for dark energy equation of state (EoS) as it gives rise to both the thawing and tracking behaviours for different values of the parameters. Analysis of the observational data does not give any clear evidence for either thawing or tracking behaviour within the context of background cosmology, However, if we consider the evolution of inhomogenities and analyze the data in this context then there is a significant evidence in favour of thawing behaviour.

6 Pages, three eps figures, new material added, new references added. Conclusion changed. Accepted for publication MNRAS

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• Constraints on dark energy from the Lyα forest baryon acoustic oscillations measurement of the redshift 2.3 Hubble parameter
• A model independent parametrization of the late time cosmic acceleration: constraints on the parameters from recent observations
• Constraining dark energy using the cross correlations of weak lensing with post-reionization probes of neutral hydrogen
• Thermodynamics and Lemaitre-Tolman-Bondi void models
• Minimal model dependent constraints on cosmological nuisance parameters and cosmic curvature from combinations of cosmological data
• Thawing and Freezing Quintessence Models: A thermodynamic Consideration
• Prospects of probing quintessence with HI 21-cm intensity mapping survey
• Probing dark energy using convergence power spectrum and bi-spectrum
• Exploring Alternative Cosmologies with the LSST: Simulated Forecasts and Current Observational Constraints
• Thawing vs. Tracker Solutions: A Dynamical Systems Approach