A new cosmological tracker solution for Quintessence

Abstract

In this paper we propose a quintessence model with the potential $V(\Phi )=V_o[\sinh (\alpha \sqrt{{\kappa }_o}\Delta \Phi ){]}^{\beta }$, which asymptotic behavior corresponds to an inverse power-law potential at early times and to an exponential one at late times. We demonstrate that this is a tracker solution and that it could have driven the Universe into its current inflationary stage. The exact solutions and the description for a complete evolution of the Universe are also given. We compare such model with the current cosmological observations.

13 pages REVTeX, 5 eps color figures

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• A Flat Universe from High-Resolution Maps of the Cosmic Microwave Background Radiation
• The Robustness of Quintessence

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