中科院数学与系统科学研究院
数学研究所
学术报告
数学物理研讨班
报告人：吴普训 教授（湖南师范大学）
题 目：Constructing luminosity relations of gamma-ray bursts and quasars by using Gaussian copula
时 间：2022年9月16日（周五）14 :00-15 :00
地 点：腾讯会议：122-873-053
摘 要：Copula is a specialized tool to describe the correlation between multivariate random variables. We use Gaussian copula to improve the Amati correlation of gamma-ray bursts (GRBs) and construct a redshift-evolutionary X-ray and ultraviolet luminosity correlation for quasars. We test the viability of these relations from copula and find that they are more viable than the standard ones. Our results show that GRBs and quasars can be regarded as the reliable indicators of the cosmic distance if the relations from copula are used to calibrate them.
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