论文标题
改善GRB作为距离指示器的采样和校准
Improving sampling and calibration of GRBs as distance indicators
论文作者
论文摘要
我们提供了来自费米GBM目录中的74个伽马射线爆发（GRB）的样本，我们为其计算距离模量并使用它们来限制有效的暗能量模型。为了克服影响GRB作为距离指标的循环问题，我们用独立于宇宙学的技术校准样品的AMATI关系。具体而言，我们使用最新的观察性哈勃参数数据，包括相关的系统，通过Bezier参数曲线近似宇宙扩展。随后，我们获得了GRB的距离模量，并将数据包含在对扩展历史的最新宇宙学观察中（Planck压缩2018年，2012年Bao Data和Pantheon Snia的Boss发行），以计算标准宇宙学模型$ CDM $ CDM和CDM $ CDM $ CDM和CPLAMATTIADS BAYESIAN后验约束。在整个分析过程中，我们努力控制误差传播并限制我们的GRB样本以避免观察偏差。结果，我们没有发现有利于$λ$ CDM型号的替代品的证据。后者与我们校准的GRB和目前可用的光度距离探针非常吻合。
We present a sample of 74 Gamma-Ray Bursts (GRBs) from the Fermi-GBM catalogue for which we compute the distance moduli and use them to constrain effective dark energy models. To overcome the circularity problem affecting GRBs as distance indicators, we calibrate the Amati relation of our sample with a cosmology-independent technique. Specifically, we use the latest observational Hubble parameter data, including associated systematics, to approximate the cosmic expansion through a Bezier parametric curve. We subsequently obtain the distance moduli of the GRBs and include the data in a suite of recent cosmological observations of the expansion history (Planck Compressed 2018, 2012 BOSS release of BAO data and Pantheon SNIa), to compute Bayesian posterior constraints for the standard cosmological model $Λ$CDM, as well as $ω$CDM, and the CPL parametrization. Throughout the analysis we strive to keep under control the error propagation and limit our GRBs sample to avoid observational bias. As a result, we find no evidence in favour of the alternatives to $Λ$CDM model. The latter agrees very well with our calibrated sample of GRBs and presently available luminosity distance probes.
