Scalar Field as Dark Energy Accelerating Expansion of the Universe
Abstract
The features of a homogeneous scalar field φ with classical Lagrangian L=φ;iφ;i/2-V(φ) and tachyon field Lagrangian L=-V(φ)1-φ;iφ;i causing the observable accelerated expansion of the Universe are analyzed. The models with constant equation-of-state parameter wde=pde/de<-1/3 are studied. For both cases the fields φ(a) and potentials V(a) are reconstucted for the parameters of cosmological model of the Universe derived from the observations. The effect of rolling down of the potential V(φ) to minimum is shown.
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