Phantom cosmology as a simple model with dynamical complexity

Details Phantom cosmology as a simple model with dynamical complexity Phantom cosmology as a simple model with dynamical complexity

2004-01-15

arxiv.org/abs/astro-ph/0401293v4

Phys.Rev.E72:036221,2005

Astronomy and Astrophysics

Astrophysics

RevTeX4, 11 pages, 2 figures; rewritten (v.2); new section on complex dynamics in cases with and without spontaneous symmetry

Scientific paper

10.1103/PhysRevE.72.036221

We study the Friedmann-Robertson-Walker model with phantom fields modelled in terms of scalar fields. We apply the Ziglin theory of integrability and find that the flat model is nonintegrable. Then we cannot expect to determine simple analytical solutions of the Einstein equations. We demonstrate that there is only a discrete set of parameters where this model is integrable. For comparison we describe the phantoms fields in terms of the barotropic equation of state. It is shown that in the contrast to the phantoms modelled as scalar fields, the dynamics is always integrable and phase portraits are constructed. In this case we find the duality relation.

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