A Two-Field Dilaton Model of Dark Energy |
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| Authors: | LIANG Nan GAO Chang-Jun ZHANG Shuang-Nan |
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| Institution: | Department of Physics and Tsinghua Center for Astrophysics, Tsinghua University, Beijing 100084National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, PO Box 918-3, Beijing 100049 |
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| Abstract: | We investigate the cosmological evolution of a two-field model of dark energy, where one is a dilaton field with canonical kinetic energy and the other is a phantom field with a negative kinetic energy term. Phase-plane analysis shows that the ``phantom'-dominated scaling solution is the stable late-time attractor of this type of model. 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 recent observations. |
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| Keywords: | 95 36 +x 98 80 -k 98 80 Es |
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