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Scherrer","submitted_at":"2019-05-14T14:14:15Z","abstract_excerpt":"We reexamine $k$-essence dark energy models with a scalar field $\\phi$ and a factorized Lagrangian, $\\mathcal L = V(\\phi)F(X)$, with $X = \\frac{1}{2} \\nabla_\\mu \\phi \\nabla^\\mu \\phi.$ A value of the equation of state parameter, $w$, near $-1$ requires either $X \\approx 0$ or $dF/dX \\approx 0$. Previous work showed that thawing models with $X \\approx 0$ evolve along a set of unique trajectories for $w(a)$, while those with $dF/dX \\approx 0$ can result in a variety of different forms for $w(a)$. 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