arXiv 0802.34282008-02astro-phgr-qchep-ph

$1.8 < z < 5.6$中的伽马射线暴表明暗能量的时间变化很小

Gamma-Ray Bursts in $1.8 < z < 5.6$ Suggest that the Time Variation of the Dark Energy is Small

Yoshiki Kodama, Daisuke Yonetoku, Toshio Murakami, Sachiko Tanabe, Ryo Tsutsui, Takashi Nakamura

备注：: 4 pages, 4 figures, accepted to MNRAS
DOI：: 10.1111/j.1745-3933.2008.00508.x

摘要：

在不假设任何宇宙学模型的情况下，我们用33个红移为$z < 1.62$的事件标定了伽玛暴的峰值能量-峰值亮度关系（所谓的米德关系）。利用大量具有$z<1.755$的Ia型超新星的光度距离估算了伽玛暴的光度距离。这个校准的米德关系可以作为一个新的宇宙距离阶梯，朝向更高的红移。利用校正后的关系，我们确定了30个伽玛暴在$1.8 < z < 5.6$中的光度距离，并在$(Ω_m,Ω_Λ)$平面上绘制了似然等高线。我们得到了一个平坦宇宙的$(Ω_m, Ω_Λ)= (0.37^{+0.14}_{-0.11}, 0.63^{+0.11}_{-0.14})$。由于我们的方法不受圆度问题的影响，我们可以说我们在$1.8 < z < 5.6$中的宇宙与为$z < 1.8$导出的所谓和谐宇宙学模型是相容的。这表明，暗能量的时间变化很小或为零，直到$z\sim 6$。

英文摘要：

We calibrated the peak energy-peak luminosity relation of GRBs (so called Yonetoku relation) using 33 events with the redshift $z < 1.62$ without assuming any cosmological models. The luminosity distances to GRBs are estimated from those of large amount of Type Ia supernovae with $z<1.755$. This calibrated Yonetoku relation can be used as a new cosmic distance ladder toward higher redshifts. We determined the luminosity distances of 30 GRBs in $1.8 < z < 5.6$ using the calibrated relation and plotted the likelihood contour in $(Ω_m,Ω_Λ)$ plane. We obtained $(Ω_m, Ω_Λ)= (0.37^{+0.14}_{-0.11}, 0.63^{+0.11}_{-0.14})$ for a flat universe. Since our method is free from the circularity problem, we can say that our universe in $1.8 < z < 5.6$ is compatible with the so called concordance cosmological model derived for $z < 1.8$. This suggests that the time variation of the dark energy is small or zero up to $z\sim 6$.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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英文摘要：

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