Dynamics of linear perturbations in the hybrid metric-Palatini gravity

被引:24
|
作者
Lima, Nelson A. [1 ]
机构
[1] Univ Edinburgh, Inst Astron, Royal Observ, Edinburgh EH9 3HJ, Midlothian, Scotland
来源
PHYSICAL REVIEW D | 2014年 / 89卷 / 08期
关键词
IA SUPERNOVAE;
D O I
10.1103/PhysRevD.89.083527
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In this work we focus on the evolution of the linear perturbations in the novel hybrid metric-Palatini theory achieved by adding a f(R) function to the gravitational action. Working in the Jordan frame, we derive the full set of linearized evolution equations for the perturbed potentials and present them in the Newtonian and synchronous gauges. We also derive the Poisson equation, and perform the evolution of the lensing potential, Phi(+), for a model with a background evolution indistinguishable from Delta CDM. In order to do so, we introduce a designer approach that allows one to retrieve a family of functions f(R) for which the effective equation of state is exactly w(eff) =-1. We conclude, for this particular model, that the main deviations from standard general relativity and the cosmological constant model arise in the distant past, with an oscillatory signature in the ratio between the Newtonian potentials, Phi and Psi.
引用
收藏
页数:11
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