arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1504.02308astro-ph.COastro-ph.HE
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利用更新的伽马射线暴和Ia型超新星对卡达西展开模型和暗能量的约束

Utilizing the Updated Gamma-Ray Bursts and Type Ia Supernovae to Constrain the Cardassian Expansion Model and Dark Energy

Jun-Jie Wei, Qing-Bo Ma, Xue-Feng Wu

摘要:

我们更新伽玛射线暴(GRB)的某些光谱和光变曲线功能之间的光度关系与139 GRB。用Union2.1 Ia型超新星(SNe Ia)的三次样条插值方法,用$z\leq1.4$的样品标定了$z>1.4$的82个伽玛暴的距离模量。利用580个Union2.1超新星Ia样品($z<1.4$)和82个校准的伽玛暴数据($1.4<z\leq8.2$),研究了Cardassian膨胀模型和暗能量的联合约束.在$Λ$ CDM中,我们发现在580个Ia超新星上增加82个高\emph{z}暴,显著改善了对$Ω_{m}-Ω_Λ$面的约束.在卡达西展开模型中,最佳拟合是$Ω_{m}= 0.24_{-0.15}^{+0.15}$和$n=0.16_{-0.52}^{+0.30}$ $(1σ)$,这与$Λ$ CDM宇宙学$(n=0)$在$1σ$置信区域中一致。我们还讨论了两个暗能量模型,其中状态方程$w(z)$分别被参数化为$w(z)=w_{0}$和$w(z)=w_{0}+w_{1}z/(1+z)$。基于我们的分析,我们看到,我们的宇宙在更高的红移高达$z=8.2$是一致的$1σ$置信水平的和谐模型。

英文摘要:

We update gamma-ray burst (GRB) luminosity relations among certain spectral and light-curve features with 139 GRBs. The distance modulus of 82 GRBs at $z>1.4$ can be calibrated with the sample at $z\leq1.4$ by using the cubic spline interpolation method from the Union2.1 Type Ia supernovae (SNe Ia) set. We investigate the joint constraints on the Cardassian expansion model and dark energy with 580 Union2.1 SNe Ia sample ($z<1.4$) and 82 calibrated GRBs data ($1.4<z\leq8.2$). In $Λ$CDM, we find that adding 82 high-\emph{z} GRBs to 580 SNe Ia significantly improves the constrain on $Ω_{m}-Ω_Λ$ plane. In the Cardassian expansion model, the best fit is $Ω_{m}= 0.24_{-0.15}^{+0.15}$ and $n=0.16_{-0.52}^{+0.30}$ $(1σ)$, which is consistent with the $Λ$CDM cosmology $(n=0)$ in the $1σ$ confidence region. We also discuss two dark energy models in which the equation of state $w(z)$ is parametrized as $w(z)=w_{0}$ and $w(z)=w_{0}+w_{1}z/(1+z)$, respectively. Based on our analysis, we see that our Universe at higher redshift up to $z=8.2$ is consistent with the concordance model within $1σ$ confidence level.

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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