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The power-law expansion universe and dark energy evolution

Yi-Huan Wei
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Abstract

In order to depict the transition from deceleration to acceleration expansion of the universe we use a power-law expansion scale factor, $a\sim t^{n_0+bt^m}$, with $n_0$, $b$ and $m$ three parameters determined by $H_0$, $q_0$ and $z_T$. For the spatially flat, isotropic and homogeneous universe, such a scale factor leads to the results that the dark energy density is slowly changing currently, and predicts the equation of state $w_X$ changes from $w_X>-1$ to $w_X<-1$.

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Yi-Huan Wei. 2005-02-03. The power-law expansion universe and dark energy evolution. https://arxiv.org/abs/astro-ph/0405368

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