Overcoming the circular problem for gamma-ray bursts in cosmological global-fitting analysis

	Overcoming the circular problem for gamma-ray bursts in cosmological global-fitting analysis
	Li, H; Xia JQ(夏俊卿); Liu J(刘杰); Zhang XM(张新民); Xia, JQ; Liu, J; Zhao, GB; Fan, ZH; Zhang, XM
刊名	ASTROPHYSICAL JOURNAL
	2008
卷号	680 期号:1 页码:#REF!
关键词	cosmological parameters cosmology : observations gamma rays : bursts
通讯作者	Li, H (reprint author), Peking Univ, Dept Astron, Sch Phys, Beijing 100871, Peoples R China.
英文摘要	Due to the lack of low-redshift long gamma-ray bursts (GRBs), the circular problem has been a severe obstacle for using GRBs as cosmological candles. In this paper, we present a new method to deal with such a problem in Markov chain Monte Carlo (MCMC) global fitting analysis. Assuming a certain type of correlation, for the parameters involved in the correlation relation, we treat them as free parameters and determine them simultaneously with cosmological parameters through MCMC analysis on GRB data together with other observational data. Then the circular problem is naturally eliminated in this procedure. To demonstrate the feasibility of our method, we take the Ghirlanda relation (E-gamma proportional to CEpeakA) as an example, while keeping in mind the debate about its physical validity. Together with SN Ia, WMAP, and SDSS data, we include 27 GRBs with the reported Ghirlanda relation in our study and perform MCMC global fitting. We consider the Lambda CDM model and dynamical dark energy models, respectively. We also include the curvature of the universe in our analysis. In each case, in addition to the constraints on the relevant cosmological parameters, we obtain the best-fit values as well as the distributions of the correlation parameters A and C. With CMB+LSS+SNe+GRB data included in the analysis, the results on A and C for different cosmological models are in agreement well within a 1 sigma range. It is also noted that the distributions of A and C are generally broader than the priors used in many studies in the literature. Our method can be readily applied to other GRB relations, which might be better physically motivated.
学科主题	Astronomy & Astrophysics
类目[WOS]	Astronomy & Astrophysics
收录类别	SCI
WOS记录号	WOS:000256500800007
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/226084]
专题	高能物理研究所_理论物理室高能物理研究所_粒子天体物理中心
推荐引用方式 GB/T 7714	Li, H,Xia JQ,Liu J,et al. Overcoming the circular problem for gamma-ray bursts in cosmological global-fitting analysis[J]. ASTROPHYSICAL JOURNAL,2008,680(1):#REF!.
APA	Li, H.,夏俊卿.,刘杰.,张新民.,Xia, JQ.,...&Zhang, XM.(2008).Overcoming the circular problem for gamma-ray bursts in cosmological global-fitting analysis.ASTROPHYSICAL JOURNAL,680(1),#REF!.
MLA	Li, H,et al."Overcoming the circular problem for gamma-ray bursts in cosmological global-fitting analysis".ASTROPHYSICAL JOURNAL 680.1(2008):#REF!.