Scalar field as dark energy accelerating expansion of the Universe |
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| Authors: | O Sergijenko B Novosyadlyj |
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| Institution: | (1) Chair of Theoretical Physics and Astronomical Observatory of Ivan Franko National University of Lviv, Lviv, Russia |
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| Abstract: | The features of a homogeneous scalar field ϕ with classical Lagrangian L = ϕ;i
ϕ;i
/2 − V(ϕ) and tachyon field Lagrangian L = −V(ϕ)√1 − ϕ;i
ϕ;i
causing the observable accelerated expansion of the Universe are analyzed. The models with constant equation-of-state parameter
w
de = p
de/ρde < −1/3 are studied. For both cases the fields ϕ(a) and potentials V(a) are reconstructed 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.
Published in Ukrainian in Kinematika i Fizika Nebesnykh Tel, 2008, Vol. 24, No. 5, pp. 345–359.
The article was translated by the authors. |
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| Keywords: | |
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