论文标题
完成的SDSS-IV扩展Baryon振荡光谱调查：用于测量宇宙结构增长和膨胀速率的傅立叶空间中的多迹迹分析
The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: a multi-tracer analysis in Fourier space for measuring the cosmic structure growth and expansion rate
论文作者
论文摘要
我们使用Eboss DR16 LRG和ELG样品进行$ z \的EBOSS DR16 LRG和ELG样品进行联合的BAO和RSD分析，并在[0.6,1.1] $中进行$ Z \，并以$ \sim4σ$ prurites Level的跨功率谱从跨功率谱中检测到RSD信号，即eff} = 0.77 $。基于链接的功率谱，这是减轻角系统学的这项工作的新发展，我们同时在两个有效的红移时同时测量BAO距离和增长率，即$ d _ {\ rm m}/rm m}/r _ {\ rm d}} \（z = 0.70） h}/r _ {\ rm d} \（z = 0.70）= 21.22 \ pm1.20，\fσ_8\（z = 0.70）= 0.43 \ pm0.05 $，和$ d _ {\ rm m m} d _ {\ rm H}/r _ {\ rm d} \（z = 0.845）= 20.91 \ pm2.86，\fσ_8\（z = 0.845）= 0.30 \ pm0.08 $。结合BAO测量值，包括来自Eboss DR16 QSO和Lyman- $α$样品的测量值，我们的测量值提高了非零$ω_ {\rmλ} $的显着性水平到$ \sim11σ$。
We perform a joint BAO and RSD analysis using the eBOSS DR16 LRG and ELG samples in the redshift range of $z\in[0.6,1.1]$, and detect a RSD signal from the cross power spectrum at a $\sim4σ$ confidence level, i.e., $fσ_8=0.317\pm0.080$ at $z_{\rm eff}=0.77$. Based on the chained power spectrum, which is a new development in this work to mitigate the angular systematics, we measurement the BAO distances and growth rate simultaneously at two effective redshifts, namely, $D_{\rm M}/r_{\rm d} \ (z=0.70)=17.96\pm0.51, \ D_{\rm H}/r_{\rm d} \ (z=0.70)=21.22\pm1.20, \ fσ_8 \ (z=0.70) =0.43\pm0.05$, and $D_{\rm M}/r_{\rm d} \ (z=0.845)=18.90\pm0.78, \ D_{\rm H}/r_{\rm d} \ (z=0.845)=20.91\pm2.86, \ fσ_8 \ (z=0.845) =0.30\pm0.08$. Combined with BAO measurements including those from the eBOSS DR16 QSO and Lyman-$α$ sample, our measurement has raised the significance level of a nonzero $Ω_{\rm Λ}$ to $\sim11σ$.
