宇宙学扰动演化中如何最佳参数化偏离广义相对论
How to optimally parametrize deviations from General Relativity in the evolution of cosmological perturbations
摘要：
下一代弱透镜巡天将通过一系列的时期追踪大尺度扰动的增长，为在宇宙尺度上检验广义相对论（GR）提供了机会。我们详细回顾了MGCAMB中使用的参数化来描述替代引力理论和广义暗能量模型中预期的修改后的增长。我们强调了它的优势并研究了几个理论方面。特别是，我们表明，同一组方程可以始终使用超地平线和地平线下的线性尺度。我们还强调数据的敏感性，规模依赖的功能的增长模式，并建议使用主成分分析收敛到一个实际的参数集，这是最有可能检测偏离GR。与其他参数化的连接也进行了讨论。
英文摘要：
The next generation of weak lensing surveys will trace the growth of large scale perturbations through a sequence of epochs, offering an opportunity to test General Relativity (GR) on cosmological scales. We review in detail the parametrization used in MGCAMB to describe the modified growth expected in alternative theories of gravity and generalized dark energy models. We highlight its advantages and examine several theoretical aspects. In particular, we show that the same set of equations can be consistently used on super-horizon and sub-horizon linear scales. We also emphasize the sensitivity of data to scale-dependent features in the growth pattern, and propose using Principal Component Analysis to converge on a practical set of parameters which is most likely to detect departures from GR. The connection with other parametrizations is also discussed.
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