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arXiv 0908.1585astro-ph.COastro-ph.GA
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CMB对暗能量和修正引力场的透镜约束

CMB Lensing Constraints on Dark Energy and Modified Gravity Scenarios

Erminia Calabrese, Asantha Cooray, Matteo Martinelli, Alessandro Melchiorri, Luca Pagano, Anze Slosar, George F. Smoot

摘要:

弱引力透镜在宇宙微波背景温度和偏振角功率谱上留下了特征印记。在这里,我们调查可能的限制,从未来的CMB角谱测量预计从普朗克和EPIC的综合透镜潜力。我们发现,普朗克和EPIC将限制在6%和1%的水平分别负责透镜的集成投影电位的振幅,非常小的灵敏度的形状的透镜电位。我们讨论了这种测量在约束暗能量和修正的引力标量张量理论中的意义。然后讨论了弱透镜势振幅的错误假设对宇宙学参数推断的影响。

英文摘要:

Weak gravitational lensing leaves a characteristic imprint on the cosmic microwave background temperature and polarization angular power spectra. Here we investigate the possible constraints on the integrated lensing potential from future CMB angular spectra measurements expected from Planck and EPIC. We find that Planck and EPIC will constrain the amplitude of the integrated projected potential responsible for lensing at 6% and 1% level, respectively with very little sensitivity to the shape of the lensing potential. We discuss the implications of such a measurement in constraining dark energy and modified gravity scalar-tensor theories. We then discuss the impact of a wrong assumption on the weak lensing potential amplitude on cosmological parameter inference.

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