Quintessence Model and Observational Constraints

Details Quintessence Model and Observational Constraints Quintessence Model and Observational Constraints

2002-03-04

arxiv.org/abs/gr-qc/0203007v2

Class.Quant.Grav. 19 (2002) 4537-4542

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

update references,add acknowledgements and correct some errors, accepted for publication in class. and quant. grav

Scientific paper

10.1088/0264-9381/19/17/305

The recent observations of type Ia supernovae strongly support that the universe is accelerating now and decelerated in the recent past. By assuming a general relation between the quintessence potential and the quintessence kinetic energy, a general relation is found between the quintessence energy density and the scale factor. The potential includes both the hyperbolic and the double exponential potentials. A detailed analysis of the transition from the deceleration phase to the acceleration phase is then performed. We show that the current constraints on the transition time, the equation of state and the energy density of the quintessence field are satisfied in the model.

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