1Department of Physics and Tsinghua Center for Astrophysics, Tsinghua University, Beijing 1000842National Astronomical Observatories, Chinese Academy of Sciences, Beijing 1000123Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, PO Box 918-3, Beijing 100049
A Two-Field Dilaton Model of Dark Energy
LIANG Nan1, GAO Chang-Jun2, ZHANG Shuang-Nan 1,3
1Department of Physics and Tsinghua Center for Astrophysics, Tsinghua University, Beijing 1000842National Astronomical Observatories, Chinese Academy of Sciences, Beijing 1000123Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, PO Box 918-3, Beijing 100049
摘要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.
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.
LIANG Nan;GAO Chang-Jun;ZHANG Shuang-Nan;. A Two-Field Dilaton Model of Dark Energy[J]. 中国物理快报, 2009, 26(6): 69501-069501.
LIANG Nan, GAO Chang-Jun, ZHANG Shuang-Nan,. A Two-Field Dilaton Model of Dark Energy. Chin. Phys. Lett., 2009, 26(6): 69501-069501.
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