Towards a fully consistent parametrization of modified gravity
Towards a fully consistent parametrization of modified gravity
复制标题
实现修正重力的完全一致的参数化
DOI：
10.1103/physrevd.84.124018
复制
发表时间：
2011
影响因子：
5
通讯作者：
Baker T
中科院分区：
文献类型：
--
作者：
Baker T
There is a distinct possibility that current and future cosmological data can be used to constrain Einstein’s theory of gravity on the very largest scales. To be able to do this in a model-independent way, it makes sense to work with a general parameterization of modified gravity. Such an approach would be analogous to the Parameterized Post-Newtonian (PPN) approach which is used on the scale of the Solar System. A few such parameterizations have been proposed and preliminary constraints have been obtained. We show that the majority of such parameterizations are only exactly applicable in the quasistatic regime. On larger scales they fail to encapsulate the full behavior of typical models currently under consideration. We suggest that it may be possible to capture the additions to the ‘Parameterized Post-Friedmann’ (PPF) formalism by treating them akin to fluid perturbations.
