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Cosmological Scaling Solutions and Multiple Exponential Potentials


We present a phase-space analysis of cosmology containing multiple scalar fields with positive and negative exponential potentials. We show that there exist power-law multi-kinetic potential scaling solutions for sufficiently flat positive potentials or steep negative potentials.The former is the unique late-time attractor and the well-known assisted inflationary solution, but the later is never unstable in an expanding universe. Moreover, for steep negative potentials there exist a kinetic-dominated regime in which each solution is a late-time attractor. We briefly discuss the physical consequences of these results.
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Recommended references: Zong-Kuan Guo,Yun-Song Piao,Yuan-Zhong Zhang.(2017).Cosmological Scaling Solutions and Multiple Exponential Potentials.[ChinaXiv:201709.00144] (Click&Copy)
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[V1] 2017-09-27 14:24:11 chinaXiv:201709.00144V1 Download
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