延迟校正与标准标尺
Delayed Recombination and Standard Rulers
摘要：
星系巡天中的重子声振荡测量被认为是限制暗能量的有力工具。然而，这种方法依赖于从宇宙微波背景各向异性测量得到的复合时声视界大小的知识。这个估计通常是假设一个标准的复合方案得出的;额外的辐射源可以延迟复合，改变宇宙电离历史和宇宙学推论来自CMB和BAO数据。在本文中，我们量化延迟复合的影响，从未来的BAO调查，如BOSS和WFMOS的暗能量参数的测定。我们发现影响很小，但仍然不可忽视。特别是，如果复合是非标准的（到CMB数据仍然允许的水平），但这被忽略了，未来的调查可能会错误地建议存在红移依赖的暗能量成分。另一方面，在延迟复合的情况下，增加一个额外的参数描述偏离标准复合的分析，并没有显着降低误差条的暗能量参数，并产生无偏估计。
英文摘要：
Measurements of Baryonic Acoustic Oscillations in galaxy surveys have been recognized as a powerful tool for constraining dark energy. However, this method relies on the knowledge of the size of the acoustic horizon at recombination derived from Cosmic Microwave Background Anisotropy measurements. This estimate is typically derived assuming a standard recombination scheme; additional radiation sources can delay recombination altering the cosmic ionization history and the cosmological inferences drawn from CMB and BAO data. In this paper we quantify the effect of delayed recombination on the determination of dark energy parameters from future BAO surveys such as BOSS and WFMOS. We find the impact to be small but still not negligible. In particular, if recombination is non-standard (to a level still allowed by CMB data), but this is ignored, future surveys may incorrectly suggest the presence of a redshift dependent dark energy component. On the other hand, in the case of delayed recombination, adding to the analysis one extra parameter describing deviations from standard recombination, does not significantly degrade the error-bars on dark energy parameters and yields unbiased estimates.
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