Three steps to accelerated expansion

Details Three steps to accelerated expansion Three steps to accelerated expansion

2009-11-11

arxiv.org/abs/0911.2208v2

Ann.Phys. (Berlin) 19, 320 (2010)

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages, 1 fig; w-art.cls; prepared for the proceedings of The Grassmannian Conference in Fundamental Cosmology "Grasscosmofun

Scientific paper

10.1002/andp.201010437

We study the dynamics of a non-minimally coupled scalar field cosmology with a potential function. We use the framework of dynamical systems theory to investigate all evolutional paths admissible for all initial conditions. Additionally, we assume the presence of barotropic matter and show that the dynamics can be formulated in terms of an autonomous dynamical system. We have found fixed points corresponding to three main stages of the evolution of the universe, namely, radiation, matter and quintessence domination epochs. Using the linearization of the dynamical systems in the vicinity of the critical points we explicitly obtain formulas determining the effective equation of state parameter for the universe at different epochs. In our approach the form of $w(z)$ parametrisation is derived directly from the dynamical equations rather than postulated {\it a priori}.

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