单个H2系统中质子-电子质量比变化的鲁棒极限
Robust limit on a varying proton-to-electron mass ratio from a single H2 system
摘要：
无量纲基本物理常数mu=m_p/m_e的变化可以通过观测遥远类星体光谱中分子氢的莱曼线和维尔纳线来检验。我们的目的是评估的准确性的调查有关可能的变化亩，并提供更强大的结果，类星体0347-383。我们的目标是解决目前关于mu变化的争议，并为不同的发现提供解释。我们不是通过另一个单一的结果，而是通过提供解决问题的替代方法来实现这一目标。提出了一种基于类星体0347-383独立数据集的分析方法，并对数据分析中的一些步骤提出了新的方法。我们分析了同一吸收系统的两组独立观测数据，并首次对观测到的离散光谱之间的偏移进行了修正。利用类星体0347-383中单个吸收系统的两组独立观测数据，我们的详细分析得出dmu/mu = 15 +/-（9_stat + 6_sys）x 10^{-6} at z_abs=3.025。基于整体的拟合优度，我们估计精度的限制约为300米/秒，包括约180米/秒，由于拟合的不确定性和约120米/秒分配给系统学。这项工作提出了替代方法来处理系统学，并介绍了在不久的将来可用的类星体光谱的精度分析所需的方法。
英文摘要：
The variation of the dimensionless fundamental physical constant mu=m_p/m_e can be checked through observation of Lyman and Werner lines of molecular hydrogen in the spectra of distant QSOs. Our intention is to asses the accuracy of the investigation concerning a possible variation of mu and to provide more robust results for QSO 0347-383. The goal in mind is to resolve the current controversy on variation of mu and devise explanations for the different findings. We achieve this not by another single result but by providing alternative approaches to the problem. An analysis based on independent data sets of QSO 0347-383 is put forward and new approaches for some of the steps involved in the data analysis are introduced. We analyse two independent sets of observations of the same absorption system and for the first time we apply corrections for the observed offsets between discrete spectra Drawing on two independent observations of a single absorption system in QSO 0347-383 our detailed analysis yields dmu/mu = 15 +/- (9_stat + 6_sys) x 10^{-6} at z_abs=3.025. Based on the overall goodness-of-fit we estimate the limit of accuracy to about 300 m/s, consisting of roughly 180 m/s due to the uncertainty of the fit and about 120 m/s allocated to systematics This work presents alternative approaches to handle systematics and introduces methods required for precision analysis of QSO spectra available in the near future.
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