Regular Article - Theoretical Physics
Will there be again a transition from acceleration to deceleration in course of the dark energy evolution of the universe?
Department of Mathematics, Jadavpur University, Kolkata, 700032, India
* e-mail: firstname.lastname@example.org
Revised: 12 August 2013
Published online: 24 September 2013
In this work we consider the evolution of the interactive dark fluids in the background of homogeneous and isotropic FRW model of the universe. The dark fluids consist of a warm dark matter and a dark energy and both are described as perfect fluid with barotropic equation of state. The dark species interact non-gravitationally through an additional term in the energy conservation equations. An autonomous system is formed in the energy density spaces and fixed points are analyzed. A general expression for the deceleration parameter has been obtained and it is possible to have more than one zero of the deceleration parameter. Finally, vanishing of the deceleration parameter has been examined with some examples.
© Springer-Verlag Berlin Heidelberg and Società Italiana di Fisica, 2013