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arXiv 1502.03442astro-ph.CO
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使用弱透镜统计解开暗扇区模型

Disentangling dark sector models using weak lensing statistics

Carlo Giocoli, R. Benton Metcalf, Marco Baldi, Massimo Meneghetti, Lauro Moscardini, Margarita Petkova

摘要:

我们使用GLAMER引力透镜代码在从CoDECS模拟中提取的高分辨率光锥内执行多平面射线追踪:一套宇宙学运行具有暗能量和冷暗物质之间的耦合。我们表明,耦合的存在是显而易见的,不仅在红移演化的收敛功率谱的归一化,但也在非线性结构的形成相对于ΛCDM的差异。在ΛCDM宇宙学假设下,利用层析方法,我们证明了如果真正的宇宙学是耦合的暗能量宇宙学,弱透镜测量将导致σ8值随源红移而变化.这为这些类型的模型提供了一个通用的null测试。我们还发现,不同的耦合暗能量模型可以显示出增强或抑制的相关性与不同的源红移的收敛映射相比,ΛCDM。这将提供一种直接的方法来区分耦合暗能量场景的不同可能实现。最后,我们讨论了耦合对几个透镜观测的影响,为不同的源红移和角尺度与现实的源红移分布,目前的地基和未来的天基透镜调查。

英文摘要:

We perform multi-plane ray-tracing using the GLAMER gravitational lensing code within high-resolution light-cones extracted from the CoDECS simulations: a suite of cosmological runs featuring a coupling between Dark Energy and Cold Dark Matter. We show that the presence of the coupling is evident not only in the redshift evolution of the normalisation of the convergence power spectrum, but also in differences in non-linear structure formation with respect to ΛCDM. Using a tomographic approach under the assumption of a ΛCDM cosmology, we demonstrate that weak lensing measurements would result in a σ8 value that changes with the source redshift if the true underlying cosmology is a coupled Dark Energy one. This provides a generic null test for these types of models. We also find that different models of coupled Dark Energy can show either an enhanced or a suppressed correlation between convergence maps with differing source redshifts as compared to ΛCDM. This would provide a direct way to discriminate between different possible realisations of the coupled Dark Energy scenario. Finally, we discuss the impact of the coupling on several lensing observables for different source redshifts and angular scales with realistic source redshift distributions for current ground-based and future space-based lensing surveys.

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