Some Consequences of Dark Energy Density varying Exponentially with Scale Factor

Details Some Consequences of Dark Energy Density varying Exponentially with Scale Factor Some Consequences of Dark Energy Density varying Exponentially with Scale Factor

2005-11-10

arxiv.org/abs/astro-ph/0511303v1

Mod.Phys.Lett.A20:2805-2818,2005

Astronomy and Astrophysics

Astrophysics

22 pages, 6 figures

Scientific paper

10.1142/S0217732305017858

In this paper we have explored the consequences of a model of dark energy with its energy density varying exponentially with the scale factor. We first consider the model with $ \rho_{\phi} \propto e^{\kappa a} $, where $\kappa $ is a constant. This is a kind of generalisation of the cosmological constant model with $\kappa = 0$. We show that such an exponentially varying dark energy density with the scale factor naturally leads to an equivalent phantom field. We also consider a model with $ \rho_{\phi} \propto e^{\kappa /a} $ and we show that this also naturally leads to an equivalent phantom field.

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