arXiv 0807.29112008-07-18astro-ph

高红移伽马射线暴暗能量对$w_0$和$w_a$的约束

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

备注：: 5 pages, 6 figures. Submitted tu MNRAS
发表信息：: Mon.Not.Roy.Astron.Soc.394:L31-L35,2009
DOI：: 10.1111/j.1745-3933.2008.00604.x

摘要：

通过峰值能量-峰值亮度关系（所谓的米德关系），将哈勃图推广到63个伽马射线暴的$z = 5.6$，得到了由$P/ρ\equiv w(z) = w_0 + w_a \cdot z/(1+z)$参数化的包括动力学暗能量在内的宇宙学参数的约束.结果表明，在2 σ水平上，目前的伽玛暴数据与一致性模型（$Ω_m = 0.28, Ω_Λ = 0.72, w_0 = -1, w_a = 0$）是一致的。虽然来自伽玛暴本身的约束不是很强，但由于伽玛暴有更高的红移，它们可以改善来自SNeIa的传统约束。通过蒙特卡罗模拟，我们进一步估计了GLAST（Gamma-ray Large Area Space Telescope）和\swift对暗能量参数的约束。如果再增加150个伽玛射线暴，限制将大大改善。

英文摘要：

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.

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英文摘要：

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