arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0911.3448astro-ph.COastro-ph.IMphysics.comp-ph
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暗能量、中微子和初始条件的弱透镜预报

Weak lensing forecasts for dark energy, neutrinos and initial conditions

Ivan Debono, Anais Rassat, Alexandre Refregier, Adam Amara, Thomas D. Kitching

摘要:

弱引力透镜通过测量低红移宇宙的质量分布和几何形状提供了一种灵敏的宇宙学探测。我们展示了如何一个全天空弱透镜层析调查可以共同约束不同的宇宙学参数描述暗能量,大质量中微子(热暗物质),和原始的功率谱。为了将所有扇区置于平等的基础上,我们引入了一个新的参数$β$,二阶运行谱指数。使用Fisher矩阵的形式主义,有和没有CMB先验,我们研究了如何的约束变化的参数集被扩大。我们发现,弱透镜与CMB先验提供了强大的约束暗能量参数,并可以同时提供强约束所有三个部门。我们发现,暗能量部门在很大程度上是不敏感的,包括其他宇宙部门。规划未来的调查的影响进行了讨论。

英文摘要:

Weak gravitational lensing provides a sensitive probe of cosmology by measuring the mass distribution and the geometry of the low redshift universe. We show how an all-sky weak lensing tomographic survey can jointly constrain different sets of cosmological parameters describing dark energy, massive neutrinos (hot dark matter), and the primordial power spectrum. In order to put all sectors on an equal footing, we introduce a new parameter $β$, the second order running spectral index. Using the Fisher matrix formalism with and without CMB priors, we examine how the constraints vary as the parameter set is enlarged. We find that weak lensing with CMB priors provides robust constraints on dark energy parameters and can simultaneously provide strong constraints on all three sectors. We find that the dark energy sector is largely insensitive to the inclusion of the other cosmological sectors. Implications for the planning of future surveys are discussed.

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