期刊
PHYSICS LETTERS B
卷 608, 期 3-4, 页码 177-182出版社
ELSEVIER
DOI: 10.1016/j.physletb.2005.01.017
关键词
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We investigate in this Letter 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 greater than or equal to -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. (C) 2005 Elsevier B.V. All rights reserved.
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