利用多种星系群在正午之前进行宇宙学研究
Cosmology before noon with multiple galaxy populations
AI总结：
本研究利用Fisher预测探讨多示踪物宇宙学，发现加入透镜和LAE可显著提升参数约束，尤其是f_EDE的约10倍改进，并初步评估了辐射传输对预测的影响。
摘要：
观测高红移宇宙（2<z<5）的近未来设施将有机会通过观测物质密度场的多个示踪物：Lyman alpha发射体（LAE）、Lyman break星系（LBG）和CMB透镜κ，来利用“多示踪物”宇宙学。在本研究中，我们使用Fisher预测来研究多示踪物对下一代设施的影响。与以往的研究一致，我们表明多个示踪物主要通过打破简并性来改善约束，而不是传统直觉中的样本方差抵消。然后，我们预测对于BBN和CMB初始先验，将透镜和LAE添加到仅LBG样本中将在许多参数上获得25%或更多的提升，其中最大的提升是f_EDE的约10倍改进。我们通过在线性理论层面引入简化模型，初步探讨了辐射传输（RT）对涉及LAE预测的影响。我们的结果虽然是初步的，但表明虽然RT强烈影响仅LAE的预测，但其对复合多示踪物预测的影响有限。
英文摘要：
Near-future facilities observing the high-redshift universe ($2<z<5$) will have an opportunity to take advantage of "multi-tracer" cosmology by observing multiple tracers of the matter density field: Lyman alpha emitters (LAE), Lyman break galaxies (LBG), and CMB lensing $κ$. In this work we use Fisher forecasts to investigate the effect of multi-tracers on next-generation facilities. In agreement with previous work, we show that multiple tracers improve constraints primarily from degeneracy breaking, instead of the traditional intuition of sample variance cancellation. Then, we forecast that for both BBN and CMB primary priors, the addition of lensing and LAEs onto a LBG-only sample will gain 25\% or more in many parameters, with the largest gains being factor of $\sim10$ improvement for $f_{\rm EDE}$. We include a preliminary approach towards modelling the impact of radiative transfer (RT) on forecasts involving LAEs by introducing a simplified model at linear theory level. Our results, albeit preliminary, show that the while RT influences LAE-only forecasts strongly, its effect on composite multi-tracer forecasts are limited.
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。
