Constraints on $w_0$ and $w_a$ of Dark Energy from High Redshift Gamma Ray Bursts

Ryo Tsutsui; Takashi Nakamura; Daisuke Yonetoku; Toshio Murakami; Sachiko Tanabe; Yoshiki Kodama; Keitaro Takahashi

doi:10.1111/j.1745-3933.2008.00604.x

paper

Constraints on $w_{0}$ and $w_{a}$ of Dark Energy from High Redshift Gamma Ray Bursts

arXiv:0807.2911 · doi:10.1111/j.1745-3933.2008.00604.x

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 $P / ρ \equiv w (z) = w_{0} + w_{a} \cdot z / (1 + z)$ . It is found that the current GRB data are consistent with the concordance model, ( $Ω_{m} = 0.28, Ω_{Λ} = 0.72, w_{0} = - 1, w_{a} = 0$ ), 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.

arXiv comment5 pages, 6 figures. Submitted tu MNRAS

Constraints on $w_{0}$ and $w_{a}$ of Dark Energy from High Redshift Gamma Ray Bursts

Abstract

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Constraints on w0​ and wa​ of Dark Energy from High Redshift Gamma Ray Bursts

Abstract

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Cited by in corpus (27)

Constraints on $w_{0}$ and $w_{a}$ of Dark Energy from High Redshift Gamma Ray Bursts