期刊
PHYSICS LETTERS B
卷 687, 期 2-3, 页码 99-102出版社
ELSEVIER
DOI: 10.1016/j.physletb.2010.03.047
关键词
Geometrical diagnostic; k-essence; dark energy; Dirac-Born-Infeld-like Lagrangian
资金
- Heibei University [2009-155]
- Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences [0529410T41-200901]
Geometrical diagnostic, involving the statefinder {r, s} and Om(x), is widely used to discriminate different dark energy models. We apply the statefinder {r, s} and Om(x) to purely kinetic k-essence dark energy model with Dirac-Born-Infeld-like Lagrangian which can be considered as scalar field realizations of Chaplygin gas. We plot the evolution trajectories of this model in the statefinder parameter-planes and Om(x) parameter-plane. We find that the statefinder {r, s} and Om(x) fail to distinguish purely kinetic k-essence model from Lambda CDM model at 68.3% confidence level for z << 1. (C) 2010 Elsevier B.V. All rights reserved.
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