论文标题
系统的红移偏见在BAO宇宙学中的影响
The Effect of Systematic Redshift Biases in BAO Cosmology
论文作者
论文摘要
随着即将进行的Galaxy Redshift调查提供的规模和精度的显着提高，以前可忽略的系统错误可能会变得很大。在本文中，我们探讨了低稳定的系统红移偏移对重测声振荡（BAO）特征的测量以及从此类测量结果中恢复的宇宙学约束的潜在影响。我们使用500个模拟星系红移调查作为基线样本，我们注入了一系列系统的红移偏见（范围从+/- 0.2％到+/- 2％），并测量回收的各向异性BAO量表的变化。当将BAO测量与CMB约束（在λCDM和WCDM宇宙学中）结合使用时，合理的系统学会在H0和ωm的组合拟合中可以忽略不计，并且系统学必须是比这项合理的基线更大的数量级，以便在此类组合上介绍这一组合的chimence chiptuce。我们得出的结论是，系统的红移偏见极不可能偏向于现在或不久的将来BAO Cosmology提供的H0等参数的限制。我们还详细介绍了一个理论模型，该模型可以预测均匀的红移系统对α的影响，并表明该模型与我们的模拟调查分析的结果密切一致。
With the remarkable increase in scale and precision provided by upcoming galaxy redshift surveys, systematic errors that were previously negligible may become significant. In this paper, we explore the potential impact of low-magnitude systematic redshift offsets on measurements of the Baryon Acoustic Oscillation (BAO) feature, and the cosmological constraints recovered from such measurements. Using 500 mock galaxy redshift surveys as our baseline sample, we inject a series of systematic redshift biases (ranging from +/-0.2% to +/-2%), and measure the resulting shift in the recovered isotropic BAO scale. When BAO measurements are combined with CMB constraints (in both ΛCDM and wCDM cosmologies), plausible systematics introduce a negligible offset on combined fits of H0 and Ωm, and systematics must be an order of magnitude greater than this plausible baseline to introduce a 1-σ shift on such combined fits. We conclude that systematic redshift biases are very unlikely to bias constraints on parameters such as H0 provided by BAO cosmology, either now or in the near future. We also detail a theoretical model that predicts the impact of uniform redshift systematics on α, and show this model is in close alignment with the results of our mock survey analysis.
