http://arxiv.org/abs/1607.03506
We analyze the coupled quintessence in the light of the linear dynamical systems theory, with two different interactions: i) proportional to the energy density of the dark energy and ii) proportional to the sum of the energy densities of the dark matter and dark energy. The results presented here enlarge the previous analyses in the literature, wherein the interaction has been only proportional to the energy density of the dark matter. In the first case there is neither an attractor point nor a fixed point that describes the dark-energy-dominated universe for a non-zero interaction. In the second case only the radiation or the dark energy era can be described by the fixed points. Therefore, the results for both interactions imply that these two possibilities do not provide the well-known sequence of cosmological eras.
R. Landim and F. Bernardi
Thu, 14 Jul 16
41/72
Comments: 7 pages. arXiv admin note: text overlap with arXiv:1605.03550
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