对Gaztanaga等人声称的径向BAO检测的评论
Comment on the claimed radial BAO detection by Gaztanaga et al
摘要：
Gaztanaga等人最近声称从公开的SDSS DR 6数据中测量了径向方向的重子声学振荡（BAO）尺度。他们专注于接近视线方向的发光红星系（LRG）的关联函数，以找到他们确定为BAO峰的特征，认为引力透镜的放大偏差效应增加了BAO峰的振幅，便于检测。在这篇评论中，我们澄清了透镜效应对BAO峰测量的影响可以忽略不计，Gaztanaga等人的解释是不正确的。他们在视线附近的LRG关联函数中识别的特征不能用任何已知的物理效应来解释，实际上与噪声一致。
英文摘要：
Gaztanaga et al. have recently claimed to measure the Baryon Acoustic Oscillation (BAO) scale in the radial direction from the publicly available SDSS DR6 data. They focus on the correlation function of Luminous Red Galaxies (LRG) close to the line-of-sight direction to find a feature that they identify as the BAO peak, arguing that a magnification bias effect from gravitational lensing increases the amplitude of the BAO peak, facilitating its detection. In this Comment, we clarify that lensing has a negligible impact on the measurement of the BAO peak, and that the interpretation by Gaztanaga et al. is incorrect. The feature they identify in the LRG correlation function near the line-of-sight cannot be explained by any known physical effect and is in fact consistent with noise.
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