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

Abstract

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.

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

References in corpus (6)

• Dynamics of dark energy
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Global topological k-defects
• Inflation, dark matter and dark energy in the string landscape
• MCMC analysis of WMAP3 and SDSS data points to broken symmetry inflaton potentials and provides a lower bound on the tensor to scalar ratio
• When Did Cosmic Acceleration Start ?

Cited by in corpus (6)

• Unified Dark Matter Scalar Field Models
• Pure kinetic k-essence as the cosmic speed-up
• Dark Energy in Practice
• Generalizing a Unified Model of Dark Matter, Dark Energy, and Inflation with Non Canonical Kinetic Term
• Phase-space analysis of a class of k-essence cosmology
• Localized D-dimensional global k-defects