论文标题
宇宙剪切调查在效率空间中的源分布
Source Distributions of Cosmic Shear Surveys in Efficiency Space
论文作者
论文摘要
我们表明，即使在层压板调查的情况下，宇宙剪切的镜头效率也具有简单的形状，即表现不佳的光度红移。我们认为，宇宙剪切的源分布可以在``效率空间''中更有效地进行参数。使用逼真的模拟，我们发现当前宇宙剪切调查的真正镜头效率可以描述在红移分布中的异常值，只能使用两个参数使用两个参数，而对其他参数形式和调查的方法直接概括。因此，宇宙剪切信号在很大程度上对源分布的细节不敏感，并且可以通过少数合适的效率参数来总结重要的特征。对于模拟调查，我们显示了10％级别的先验知识，这是可以实现的，例如从光度降期中，足以在效率参数上边缘化，而不会严重影响宇宙参数的约束$ω_m$和$σ_8$。
We show that the lensing efficiency of cosmic shear generically has a simple shape, even in the case of a tomographic survey with badly behaved photometric redshifts. We argue that source distributions for cosmic shear can therefore be more effectively parametrised in ``efficiency space''. Using realistic simulations, we find that the true lensing efficiency of a current cosmic shear survey without disconnected outliers in the redshift distributions can be described to per cent accuracy with only two parameters, and the approach straightforwardly generalises to other parametric forms and surveys. The cosmic shear signal is thus largely insensitive to the details of the source distributions, and the features that matter can be summarised by a small number of suitable efficiency parameters. For the simulated survey, we show that prior knowledge at the 10% level, which is attainable e.g. from photometric redshifts, is enough to marginalise over the efficiency parameters without severely affecting the constraints on the cosmology parameters $Ω_m$ and $σ_8$.
