期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 4, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2012/04/003
关键词
dark energy theory; cosmological perturbation theory
资金
- National Science Foundation of China [11075074, 11065004, 10821063, 10975142, 11033005]
- Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP) [20090091120054]
- SRF for ROCS, SEM
- Taiwan National Science Council (NSC) [NSC98-2811-M-002-501, NSC98-2119-M-002-001]
- physics department at Arizona State University
- Chinese Academy of Sciences [KJCX3-SYW-N2]
In this paper we revisit the dynamical dark energy model building based on single scalar field involving higher derivative terms. By imposing a degenerate condition on the higher derivatives in curved spacetime, one can select the models which are free from the ghost mode and the equation of state is able to cross the cosmological constant boundary smoothly, dynamically violate the null energy condition. Generally the Lagrangian of this type of dark energy models depends on the second derivatives linearly. It behaves like an imperfect fluid, thus its cosmological perturbation theory needs to be generalized. We also study such a model with explicit form of degenerate Lagrangian and show that its equation of state may cross - 1 without any instability.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据