Phantom energy mediates a long-range repulsive force

被引:56
作者
Amendola, L [1 ]
机构
[1] Osserv Astron Roma, INAF, I-00040 Rome, Italy
关键词
D O I
10.1103/PhysRevLett.93.181102
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Scalar field models with nonstandard kinetic terms have been proposed in the context of k inflation, of Born-Infeld Lagrangians, of phantom energy and, more in general, of low-energy string theory. In general, scalar fields are expected to couple to matter inducing a new interaction. In this Letter I derive the cosmological perturbation equations and the Yukawa correction to gravity for such general models. I find three interesting results: first, when the field behaves as phantom energy (equation of state less than -1), then the coupling strength is negative, inducing a long-range repulsive force; second, the dark-energy field might cluster on astrophysical scales; third, applying the formalism to a Brans-Dicke theory with a general kinetic term it is shown that its Newtonian effects depend on a single parameter that generalizes the Brans-Dicke constant.
引用
收藏
页码:181102 / 1
页数:4
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