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• W3037604672 abstract "We examine hilltop quintessence models, in which the scalar field is rolling near a local maximum in the potential, and $wensuremath{approx}ensuremath{-}1$. We first derive a general equation for the evolution of $ensuremath{phi}$ in the limit where $wensuremath{approx}ensuremath{-}1$. We solve this equation for the case of hilltop quintessence to derive $w$ as a function of the scale factor; these solutions depend on the curvature of the potential near its maximum. Our general result is in excellent agreement ($ensuremath{delta}wensuremath{lesssim}0.5%$) with all of the particular cases examined. It works particularly well ($ensuremath{delta}wensuremath{lesssim}0.1%$) for the pseudo-Nambu-Goldstone boson potential. Our expression for $w(a)$ reduces to the previously-derived slow-roll result of Sen and Scherrer in the limit where the curvature goes to zero. Except for this limiting case, $w(a)$ is poorly fit by linear evolution in $a$." @default.
• W3037604672 created "2020-07-02" @default.
• W3037604672 creator A5004433180 @default.
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• W3037604672 date "2008-12-19" @default.
• W3037604672 modified "2023-09-27" @default.
• W3037604672 title "Hilltop quintessence" @default.
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• W3037604672 doi "https://doi.org/10.1103/physrevd.78.123525" @default.
• W3037604672 hasPublicationYear "2008" @default.
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