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Class of Exact Solutions for a Cosmological Model of Unified Gravitational and Quintessence Fields by Asenjo, Felipe A.; Hojman, Sergio A. is a scholarly article available to read on EtoBox.

What is Class of Exact Solutions for a Cosmological Model of Unified Gravitational and Quintessence Fields about?

A new approach to tackle Einstein equations for an isotropic and homogeneous Friedmann--Robertson--Walker Universe in the presence of a quintessence scalar field is devised. It provides a way to get a simple exact solution to these equations. This solution determines the quintessence potential uniquely and it differs from solutions which have been used to study inflation previously. It relays on a unification of geometry and dark matter implemented through the definition of a functional relation between the scale factor of the Universe and the quintessence field. For a positive curvature Universe, this solution produces perpetual accelerated expansion rate of the Universe, while the Hubble parameter increases abruptly, attains a maximum value and decreases thereafter. The behavior of this cosmological solution is discussed and its main features are displayed. The formalism is extended to include matter and radiation.

Author

Asenjo, Felipe A.; Hojman, Sergio A.

Published

2015

Language

EN