Tachyonic Quintessential Inflation

Abstract

We study the possibility to construct an observationally viable scenario where both early Inflation and the recently detected accelerated expansion of the universe can be explained by using a single scalar field associated with the Tachyon. The Reheating phase becomes crucial to enable us to have a consistent cosmology and also to get a second accelerated expansion period. A discussion using an exponential potential is presented.

5 pages, Revtex4. Added some references. To be published in Physical Review D

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• Cosmological constraints on a dark energy model with a non-linear scalar field