A Simple Quintessence Model

Details A Simple Quintessence Model A Simple Quintessence Model

2008-09-10

arxiv.org/abs/0809.1679v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, presented at the "seventh alexander friedmann international seminar on gravitation and cosmology"

Scientific paper

A simple model of quintessential inflation with the modified exponential potential $e^{-\alpha \phi} [A+(\phi-\phi_0)^2]$ is analyzed in the braneworld context. Considering reheating via instant preheating, we conclude that the model exhibits transient acceleration at late times for $0.96 \lesssim A \alpha^2 \lesssim 1.26$ and $271 \lesssim \phi_0 \alpha \lesssim 273$, while permanent acceleration is obtained for $2.3\times10^{-8} \lesssim A \alpha^2 \lesssim 0.98$ and $255 \lesssim \phi_0 \alpha \lesssim 273$. The steep parameter $\alpha$ is constrained to be in the range $5.3 \lesssim \alpha \lesssim 10.8$.

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