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arXiv 0910.1833astro-ph.CO
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用大尺度结构检验标准宇宙学

Testing Standard Cosmology with Large Scale Structure

Arthur Stril, Robert N. Cahn, Eric V. Linder

摘要:

星系的功率谱包含了结构增长的信息,通过红移空间扭曲的增长率,以及通过重子声学振荡特征的宇宙膨胀。我们研究了两个拟议的实验,BigBOSS和JDEM-PS,测试宇宙学模型和广义相对论的能力。我们用引力增长指数γ来量化后一个结果,在广义相对论中,它的值是γ \approx 0.55。与这个值的显著偏差可能表明新的物理学超越了宇宙学的标准模型。结果表明,BigBOSS(JDEM-PS)能够以σ(γ)= 0.043(0.054)的不确定度测量γ,如果我们包括Stage III数据先验、边缘化中微子质量、时变暗能量状态方程和其他参数,则其不确定度收紧为σ(γ)= 0.031(0.038)。对于所有的暗能量参数和相关的优值,这两个实验给出了可比较的结果。我们还进行了一些研究的影响,红移范围,分辨率,处理的非线性,和偏压的演变,使进一步的改进。

英文摘要:

The galaxy power spectrum contains information on the growth of structure, the growth rate through redshift space distortions, and the cosmic expansion through baryon acoustic oscillation features. We study the ability of two proposed experiments, BigBOSS and JDEM-PS, to test the cosmological model and general relativity. We quantify the latter result in terms of the gravitational growth index γ, whose value in general relativity is γ\approx 0.55. Significant deviations from this value could indicate new physics beyond the standard model of cosmology. The results show that BigBOSS (JDEM-PS) would be capable of measuring γwith an uncertainty σ(γ) = 0.043 (0.054), which tightens to σ(γ) = 0.031 (0.038) if we include Stage III data priors, marginalizing over neutrino mass, time varying dark energy equation of state, and other parameters. For all dark energy parameters and related figures of merit the two experiments give comparable results. We also carry out some studies of the influence of redshift range, resolution, treatment of nonlinearities, and bias evolution to enable further improvement.

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