Tsutsui 2008 用Yonetoku关系定宇宙学参数

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Title:		Constraints on $w_0$ and $w_a$ of Dark Energy from High Redshift Gamma Ray Bursts
Authors:		Tsutsui, Ryo; Nakamura, Takashi; Yonetoku, Daisuke; Murakami, Toshio; Tanabe, Sachiko; Kodama, Yoshiki; Takahashi, Keitaro
Publication:		eprint arXiv:0807.2911
Publication Date:		07/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		5 pages, 6 figures. Submitted tu MNRAS
Bibliographic Code:		2008arXiv0807.2911T

Abstract

We extend the Hubble diagram up to $z = 5.6$ using 63 gamma-ray bursts (GRBs) via peak energy-peak luminosity relation (so called Yonetoku relation), and obtain constraints on cosmological parameters including dynamical dark energy parametrized by $P/\rho\equiv w(z) = w_0 + w_a \cdot z/(1+z)$. It is found that the current GRB data are consistent with the concordance model, ($\Omega_m = 0.28, \Omega_{\Lambda} = 0.72, w_0 = -1, w_a = 0$), within two sigma level. Although constraints from GRBs themselves are not so strong, they can improve the conventional constraints from SNeIa because GRBs have much higher redshifts. Further we estimate the constraints on the dark-energy parameters expected by future observations with GLAST (Gamma-ray Large Area Space Telescope) and \swift by Monte-Carlo simulation. Constraints would improve substantially with another 150 GRBs.

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