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

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.

preprint2008arXivOpen access
O. SergijenkoYu. KulinichB. NovosyadlyjV. Pelykh
astro-ph
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Open access4 authors1 topic
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O. SergijenkoYu. KulinichB. NovosyadlyjV. Pelykh

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