A k-essence Model Of Inflation, Dark Matter and Dark Energy

Details A k-essence Model Of Inflation, Dark Matter and Dark Energy A k-essence Model Of Inflation, Dark Matter and Dark Energy

2008-12-22

arxiv.org/abs/0812.4131v2

Phys.Rev.D79:103517,2009

Astronomy and Astrophysics

Astrophysics

8 pages, Latex, minor changes to match with published version

Scientific paper

10.1103/PhysRevD.79.103517

We investigate the possibility for \textit{k}-essence dynamics to reproduce the primary features of inflation in the early universe, generate dark matter subsequently, and finally account for the presently observed acceleration. We first show that for a purely kinetic \textit{k}-essence model the late time energy density of the universe when expressed simply as a sum of a cosmological constant and a dark matter term leads to a static universe. We then study another \textit{k}-essence model in which the Lagrangian contains a potential for the scalar field as well as a non-canonical kinetic term. We show that such a model generates the basic features of inflation in the early universe, and also gives rise to dark matter and dark energy at appropriate subsequent stages. Observational constraints on the parameters of this model are obtained.

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