Isocurvature modes and Baryon Acoustic Oscillations
Isocurvature modes and Baryon Acoustic Oscillations
复制标题
等曲率模式和重子声振荡
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
M. Beltrán
中科院分区：
文献类型：
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作者：
A. Mangilli;L. Verde;M. Beltrán
众所周知，从星系观测中测量重子声振荡是一种强大而强大的工具，可以限制暗能量。这种方法依赖于从宇宙微波背景各向异性测量中获得的辐射阻力下的声波视界大小的知识。在这篇文章中，我们量化了非标准初始条件对未来BAO测量暗能量参数测定的影响。特别是，如果存在等度分量(在目前数据仍然允许的水平上)，但在CMB分析中忽略了它，则声音视界和宇宙学参数的确定是有偏差的，因此，未来的调查可能会错误地表明偏离宇宙学常数。为了恢复对声界和暗能量参数的无偏确定，在分析CMB数据时，模型中必须包括等温扰动的分量。幸运的是，这样做不会显著增加参数误差。
The measurement of Baryonic Acoustic Oscillations from galaxy surveys is well known to be a robust and powerful tool to constrain dark energy. This method relies on the knowledge of the size of the acoustic horizon at radiation drag derived from Cosmic Microwave Background Anisotropy measurements. In this paper we quantify the effect of non-standard initial conditions in the form of an isocurvature component on the determination of dark energy parameters from future BAO surveys. In particular, if there is an isocurvature component (at a level still allowed by present data) but it is ignored in the CMB analysis, the sound horizon and cosmological parameters determination is biased, and, as a consequence, future surveys may incorrectly suggest deviations from a cosmological constant. In order to recover an unbiased determination of the sound horizon and dark energy parameters, a component of isocurvature perturbations must be included in the model when analyzing CMB data. Fortunately, doing so does not increase parameter errors significantly.
影响因子：
8.7
作者：
Komatsu, E.;Smith, K. M.;Wright, E. L.
通讯作者：
Wright, E. L.