arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2109.09645astro-ph.COgr-qcphysics.data-an
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星系距离指示器误差引起的哈勃常数值的偏差

Bias of the Hubble constant value caused by errors in galactic distance indicators

S. L. Parnovsky

摘要:

本文讨论了现代宇宙中哈勃参数和哈勃常数测定的偏差。这可能是由于对星系红移数据的统计处理和基于某些统计关系的估计距离,精度有限。这导致了一些影响,导致低估或高估哈勃参数时,使用任何统计处理方法,主要是最小二乘法(LSM)。当处理整个样本时,哈勃常数的值被低估了;当样本受到距离的限制时,特别是当从上方受到限制时,由于数据选择,它被显著高估了。这种偏差大大超过了用最小二乘法公式计算的哈勃常数的误差值。这些影响都证明了分析和使用蒙特卡罗模拟,引入偏差的速度和估计距离的原始数据集描述的哈勃定律。偏差的特征与实际观测结果相似。估计距离的误差高达20%。它们导致这样的事实,即当使用LSM处理相同的模拟样本时,可以获得哈勃常数的估计值,从处理整个样本时的真实值的96%到处理具有距离限制的子样本时的110%。这些效应的影响可能导致从实际数据中获得的哈勃常数存在偏差,并高估了确定该值的准确性。这可能会对确定哈勃常数的准确性提出质疑,并大大减少了从早期和现代宇宙的观测中获得的值之间的紧张关系,这在去年得到了积极的讨论。

英文摘要:

The bias in the determination of the Hubble parameter and the Hubble constant in the modern Universe is discussed. It could appear due to statistical processing of data on galaxies redshifts and estimated distances based on some statistical relations with limited accuracy. This causes a number of effects leading to either underestimation or overestimation of the Hubble parameter when using any methods of statistical processing, primarily the least squares method (LSM). The value of the Hubble constant is underestimated when processing a whole sample; when the sample is constrained by distance, especially when constrained from above, it is significantly overestimated due to data selection. The bias significantly exceeds the values of the error the Hubble constant calculated by the LSM formulae. These effects are demonstrated both analytically and using Monte Carlo simulations, which introduce deviations in both velocities and estimated distances to the original dataset described by the Hubble law. The characteristics of the deviations are similar to real observations. Errors in estimated distances are up to 20%. They lead to the fact that when processing the same mock sample using LSM, it is possible to obtain an estimate of the Hubble constant from 96% of the true value when processing the entire sample to 110% when processing the subsample with distances limited from above. The impact of these effects can lead to a bias in the Hubble constant obtained from real data and an overestimation of the accuracy of determining this value. This may call into question the accuracy of determining the Hubble constant and significantly reduce the tension between the values obtained from the observations in the early and modern Universe, which were actively discussed during the last year.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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