Current constraints on the cosmic growth history
Current constraints on the cosmic growth history
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DOI：
10.1103/physrevd.81.083534
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发表时间：
2010-02
影响因子：
5
通讯作者：
R. Bean;M. Tangmatitham
中科院分区：
文献类型：
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作者：
R. Bean;M. Tangmatitham
我们用最近的宇宙学数据提出了对宇宙增长历史的限制，考虑到如果宇宙加速是由于广义相对论或不均匀暗能量的修改而导致的，则可能会出现与 $\ensuremath{\Lambda}\mathrm{CDM}$ 的偏差。我们将 1a 型超新星、重子声振荡和宇宙微波背景 (CMB) 的宇宙膨胀历史测量与最近星系、CMB 和弱透镜巡天的结构生长限制以及综合萨克斯·沃尔夫 - 星系互相关相结合。与 $\ensuremath{\Lambda}\mathrm{CDM}$ 的偏差通过对泊松方程的现象学修改以及两个牛顿势之间的关系来参数化。我们发现，CMB 形成时存在的修改通过对精确测量的 CMB 声波峰值的影响而受到严格限制。相比之下，对增长历史后期修改的约束（如果修改与宇宙加速的开始有关，可能会出现这种情况）要弱得多，但在 95% 的置信水平下与 $\ensuremath{\Lambda}\mathrm{CDM}$ 保持一致。对于这些后期的修改，我们发现大尺度和小尺度演化的差异可以提供一个有趣的特征，通过该特征可以通过未来的宽角度覆盖、大规模结构调查来搜索修改的生长历史。
We present constraints on the cosmic growth history with recent cosmological data, allowing for deviations from $\ensuremath{\Lambda}\mathrm{CDM}$ as might arise if cosmic acceleration is due to modifications to general relativity or inhomogeneous dark energy. We combine measures of the cosmic expansion history, from Type 1a supernovae, baryon acoustic oscillations, and the cosmic microwave background (CMB), with constraints on the growth of structure from recent galaxy, CMB, and weak lensing surveys along with integated Sachs Wolfe-galaxy cross correlations. Deviations from $\ensuremath{\Lambda}\mathrm{CDM}$ are parameterized by phenomenological modifications to the Poisson equation and the relationship between the two Newtonian potentials. We find modifications that are present at the time the CMB is formed are tightly constrained through their impact on the well-measured CMB acoustic peaks. By contrast, constraints on late-time modifications to the growth history, as might arise if modifications are related to the onset of cosmic acceleration, are far weaker, but remain consistent with $\ensuremath{\Lambda}\mathrm{CDM}$ at the 95% confidence level. For these late-time modifications we find that differences in the evolution on large and small scales could provide an interesting signature by which to search for modified growth histories with future wide angular coverage, large scale structure surveys.