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• W2117142729 abstract "Dark energy with the equation of state $w(z)$ rapidly evolving from the dustlike ($wensuremath{simeq}0$ at $zensuremath{sim}1$) to the phantomlike ($ensuremath{-}1.2ensuremath{lesssim}wensuremath{lesssim}ensuremath{-}1$ at $zensuremath{simeq}0$) has been recently proposed as the best fit for the supernovae Ia data. Assuming that a dark energy component with an arbitrary scalar-field Lagrangian $p(ensuremath{varphi},{ensuremath{nabla}}_{ensuremath{mu}}ensuremath{varphi})$ dominates in the flat Friedmann universe, we analyze the possibility of a dynamical transition from the states $(ensuremath{varphi},stackrel{ifmmode dot{}else textperiodcentered fi{}}{ensuremath{varphi}})$ with $wensuremath{ge}ensuremath{-}1$ to those with $w<ensuremath{-}1$ or vice versa. We have found that generally such transitions are physically implausible because they are either realized by a discrete set of trajectories in the phase space or are unstable with respect to the cosmological perturbations. This conclusion is confirmed by a comparison of the analytic results with numerical solutions obtained for simple models. Without the assumption of the dark energy domination, this result still holds for a certain class of dark energy Lagrangians, in particular, for Lagrangians quadratic in ${ensuremath{nabla}}_{ensuremath{mu}}ensuremath{varphi}$. The result is insensitive to topology of the Friedmann universe as well." @default.
• W2117142729 created "2016-06-24" @default.
• W2117142729 creator A5032473377 @default.
• W2117142729 date "2005-01-18" @default.
• W2117142729 modified "2023-10-06" @default.
• W2117142729 title "Can dark energy evolve to the phantom?" @default.
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• W2117142729 doi "https://doi.org/10.1103/physrevd.71.023515" @default.
• W2117142729 hasPublicationYear "2005" @default.
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