𝔖 Bobbio Scriptorium
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Three steps to accelerated expansion

✍ Scribed by O. Hrycyna; M. Szydłowski

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
130 KB
Volume
19
Category
Article
ISSN
0003-3804

No coin nor oath required. For personal study only.

✦ Synopsis

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 a priori.

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