Ishwaree P Neupane 2008 Class. Quantum Grav. 25 125013 doi:10.1088/0264-9381/25/12/125013
Reconstructing a model of quintessential inflation
Ishwaree P Neupane
Show affiliationsWe present an explicit cosmological model where inflation and dark energy both could arise from the dynamics of the same scalar field. We present our discussion in the framework where the inflaton field 
attains a nearly constant velocity m−1P|d/dN| ≡ α + βexp(βN) (where N ≡ ln a is the e-folding time) during inflation. We show that the model with |α| < 0.25 and β < 0 can easily satisfy inflationary constraints, including the spectral index of scalar fluctuations (ns = 0.96 ± 0.013), tensor-to-scalar ratio (r < 0.28) and also the bound imposed on Ω during the nucleosynthesis epoch (Ω(1 ~ MeV) < 0.1). In our construction, the scalar field potential always scales proportionally to the square of the Hubble expansion rate. One may thereby account for the two vastly different energy scales associated with the Hubble parameters at early and late epochs. The inflaton energy could also produce an observationally significant effective dark energy at a late epoch without violating local gravity tests.
- PACS
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98.80.Ft Origin, formation, and abundances of the elements
- MSC
- Subjects
- Dates
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Issue 12 (21 June 2008)
Received 10 January 2008, in final form 24 April 2008
Published 2 June 2008
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Reconstructing a model of quintessential inflation
Ishwaree P Neupane 2008 Class. Quantum Grav. 25 125013
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