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arXiv 1108.2269astro-ph.CO
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用星系成像巡天检验CMB大角度相关缺陷的起源

Testing the Origin of the CMB Large-Angle Correlation Deficit with a Galaxy Imaging Survey

Andrew P. Hearin, Cameron Gibelyou, Andrew R. Zentner

摘要:

威尔金森微波各向异性探测器(WMAP)测量的宇宙微波背景(CMB)温度分布在大角度下表现出非常低的相关性。由于观测的后验性质,量化温度数据中的这一特征与标准Lambda-CDM宇宙学相冲突的程度有些模糊。一个物理机制,已被提出作为一个可能的解释赤字在大角度的温度相关性是一个抑制的原始功率的~Gpc尺度。为了区分这种异常是否是新物理学的信号,例如被抑制的原始能量,在独立于WMAP温度测量甚至其他CMB测量的数据集中对这种信号的真实性进行实验测试将是非常宝贵的。我们探讨的可能性,测试模型的功率抑制与大尺度结构的意见,并比较计划的测光和光谱调查的能力,以约束功率谱。在未来十年计划进行的调查中,像BigBOSS这样的光谱红移调查将有更多的径向模式可供研究,但我们发现这种优势被LSST或Euclid等光度调查观察到的高红移源的更大表面密度所抵消。我们还发现,约束原始功率抑制的能力是不敏感的光度红移的校准精度。我们的结论是,非常广泛的区域成像调查有可能探索可行的模型失踪的权力,但它将很难使用这样的调查,以最终排除原始电源抑制的机制背后观察到的异常。

英文摘要:

The cosmic microwave background (CMB) temperature distribution measured by the Wilkinson Microwave Anisotropy Probe (WMAP) exhibits anomalously low correlation at large angles. Quantifying the degree to which this feature in the temperature data is in conflict with standard Lambda-CDM cosmology is somewhat ambiguous because of the a posteriori nature of the observation. One physical mechanism that has been proposed as a possible explanation for the deficit in the large-angle temperature correlations is a suppression of primordial power on ~Gpc scales. To distinguish whether the anomaly is a signal of new physics, such as suppressed primordial power, it would be invaluable to perform experimental tests of the authenticity of this signal in data sets which are independent of the WMAP temperature measurements or even other CMB measurements. We explore the possibility of testing models of power suppression with large-scale structure observations, and compare the ability of planned photometric and spectroscopic surveys to constrain the power spectrum. Of the surveys planned for the next decade, a spectroscopic redshift survey such as BigBOSS will have a greater number of radial modes available for study, but we find that this advantage is outweighed by the greater surface density of high-redshift sources that will be observed by photometric surveys such as LSST or Euclid. We also find that the ability to constrain primordial power suppression is insensitive to the precision of the calibration of photometric redshifts. We conclude that very-wide-area imaging surveys have the potential to probe viable models for the missing power but that it will be difficult to use such surveys to conclusively rule out primordial power suppression as the mechanism behind the observed anomaly.

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