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Cosmological Evolution of a Quintom Model of Dark Energy

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We investigate in this paper the cosmological evolution of a dark energy model with two scalar fields where one of the scalar has canonical kinetic energy and another scalar has negative kinetic energy term. For such a system with exponential potentials we find that during the evolution of the universe the equation of state w changes from w > ?1 to w < ?1, which is consistent with the recent observations. A phase-plane analysis shows that the “phantom”-dominated scaling solution is the stable late-time attractor of this type of models.
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Recommended references: Zong-Kuan Guo,Yun-Song Piao,Xinmin Zhang,Yuan-Zhong Zhang.(2017).Cosmological Evolution of a Quintom Model of Dark Energy.[ChinaXiv:201709.00139] (Click&Copy)
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[V1] 2017-09-27 14:24:11 chinaXiv:201709.00139V1 Download
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