The Gamma-Ray Burst Hubble Diagram and Its Cosmological Implications
The Gamma-Ray Burst Hubble Diagram and Its Cosmological Implications
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DOI：
10.1088/0004-637x/772/1/43
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发表时间：
2013-01
影响因子：
3.9
通讯作者：
Jun-Jie Wei;Xuefeng Wu;F. Melia
中科院分区：
文献类型：
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作者：
Jun-Jie Wei;Xuefeng Wu;F. Melia
在本文中，我们继续建立支持的建议，使用伽马射线暴（GRB）作为标准蜡烛在构建哈勃图的红移超出目前的Ia型超新星观测。我们确认，某些光谱和光变曲线特征之间的相关性确实可以用作光度指标，并从适合这项工作的最新GRB样本中证明，用这些数据优化的ΛCDM模型的特征在于参数值与和谐模型中的参数值一致。具体地说，我们发现（Ωm，ΩΛ）<$（0.30，0.70），与从5年WMAP数据获得的（0.27，0.73）。我们还对ΛCDM和Rh = ct宇宙进行了比较分析，结果表明后者更符合GRB数据。我们发现最优的ΛCDM模型与GRB哈勃图的拟合度约为1.79，而使用Rh = ct的拟合度约为1.66。在这两种情况下，大约20%的事件距离最佳拟合曲线至少2σ，这表明非标准GRB光度的某些污染是不可避免的，或者与数据相关的误差和固有散射被低估了。主题词：宇宙学：观测，红移，理论;早期宇宙;伽玛射线暴：概述
In this paper, we continue to build support for the proposal to use gamma-ray bursts (GRBs) as standard candles in constructing the Hubble Diagram at redshifts beyond the current reach of Type Ia supernova observations. We confirm that correlations among certain spectral and lightcurve features can indeed be used as luminosity indicators, and demonstrate from the most up-to-date GRB sample appropriate for this work that the ΛCDM model optimized with these data is characterized by parameter values consistent with those in the concordance model. Specifically, we find that (Ωm,ΩΛ) ≈ (0.30, 0.70), versus (0.27, 0.73) obtained from the 5-yr WMAP data. We also carry out a comparative analysis between ΛCDM and the Rh = ct Universe and show that the latter is a better fit to the GRB data. We find that the optimal ΛCDM model fits the GRB Hubble Diagram with a reduced χdof ≈ 1.79, whereas the fit using Rh = ct results in a χdof ≈ 1.66. In both cases, about 20% of the events lie at least 2σ away from the best-fit curves, suggesting that either some contamination by non-standard GRB luminosities is unavoidable, or that the errors and intrinsic scatter associated with the data are being underestimated. Subject headings: cosmology: observations, redshift, theory; early universe; gamma-ray bursts: general