Large-scale structure formation in cosmology with classical and tachyonic scalar fields

Details Large-scale structure formation in cosmology with classical and tachyonic scalar fields Large-scale structure formation in cosmology with classical and tachyonic scalar fields

2008-09-19

arxiv.org/abs/0809.3349v2

Astronomy and Astrophysics

Astrophysics

15 pages, 5 figures, text corrected, references added, accepted by Kinematics and Physics of Celestial Bodies

Scientific paper

The evolution of scalar perturbations is studied for 2-component (non-relativistic matter and dark energy) cosmological models at the linear and non-linear stages. The dark energy is assumed to be the scalar field with either classical or tachyonic Lagrangian and constant equation-of-state parameter w. The fields and potentials were reconstructed for the set of cosmological parameters derived from observations. The comparison of the calculated within these models and experimental large-scale structure characteristics is made. It is shown that for w=const such analysis can't remove the existing degeneracy of the dark energy models.

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