Constraining dark sector perturbations I: cosmic shear and CMB lensing
Constraining dark sector perturbations I: cosmic shear and CMB lensing
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DOI：
10.1088/1475-7516/2015/04/048
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发表时间：
2014-09
影响因子：
6.4
通讯作者：
R. Battye;A. Moss;J. Pearson
中科院分区：
文献类型：
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作者：
R. Battye;A. Moss;J. Pearson
我们提出了当前和未来对暗扇区微扰状态方程的约束。所考虑的状态方程对应于广义标量场模型和等效于相对论弹性介质模型和违反质量引力的洛伦兹模型的时间微分同胚不变量理论。我们对这些模型的可观察影响有了理论上的理解。为了约束这些模型，我们使用了来自普朗克的CMB温度数据、BAO测量数据、来自普朗克和南极望远镜的CMB透镜数据，以及来自CFHTLenS的弱星系透镜数据。我们在参数范围内发现了非平凡的排除，尽管数据仍然与w= - 1兼容。我们估计未来的实验将如何帮助约束这些参数。这是通过对CMB实验（如CoRE和PRISM）的似然分析以及星系弱透镜层析成像调查来完成的，重点关注欧几里得在轻度非线性尺度上的潜在区别能力。
We present current and future constraints on equations of state for dark sector perturbations. The equations of state considered are those corresponding to a generalized scalar field model and time-diffeomorphism invariant ℒ(g) theories that are equivalent to models of a relativistic elastic medium and also Lorentz violating massive gravity. We develop a theoretical understanding of the observable impact of these models. In order to constrain these models we use CMB temperature data from Planck, BAO measurements, CMB lensing data from Planck and the South Pole Telescope, and weak galaxy lensing data from CFHTLenS. We find non-trivial exclusions on the range of parameters, although the data remains compatible with w=−1. We gauge how future experiments will help to constrain the parameters. This is done via a likelihood analysis for CMB experiments such as CoRE and PRISM, and tomographic galaxy weak lensing surveys, focussing in on the potential discriminatory power of Euclid on mildly non-linear scales.