论文标题
用宇宙学模型以非标准的声音范围来限制使用宇宙扩展历史的空间曲率
Constraining the spatial curvature with cosmic expansion history in a cosmological model with a non-standard sound horizon
论文作者
论文摘要
空间曲率是我们当前一致性$λ$ CDM模型中最基本的参数之一。这项工作的目的是研究如何受到声音范围的假设影响空间曲率的约束。声音范围是使用宇宙微波背景（CMB）和BARYON声学振荡（BAOS）的标准标准器（BAOS）的基本数量。例如，我们研究了轴突状早期黑暗能量（EDE）模型中的曲率约束，这是根据普兰克（Planck），南极望远镜（SPT）（SPT）和Atacama宇宙望远镜（ACT）（ACT）的最新宇宙学数据集（ACT）以及Sloan Digital Sky Surge Surveers 16。 CMB功率光谱即使使用空间曲率，也像以前的工作中一样精确，始终如一。我们还证明，将CMB与BAO结合起来非常有力，即使在EDE模型中降低了声音率的曲率参数，在ACT+BAO的情况下，$ω_k= -0.0056 \ pm 0.0031 $，在EDE模型的参数之后，$ω_k= -0.0056 \ pm 0.0031 $。该约束与Planck+Bao一样具有竞争力，导致$λ$ CDM型号，$ω_{k} = -0.0001 \ pm 0.0018 $。
Spatial curvature is one of the most fundamental parameters in our current concordance flat $Λ$CDM model of the Universe. The goal of this work is to investigate how the constraint on the spatial curvature is affected by an assumption on the sound horizon scale. The sound horizon is an essential quantity to use the standard ruler from the Cosmic Microwave Background (CMB) and Baryon Acoustic Oscillations (BAOs). As an example, we study the curvature constraint in an axion-like Early Dark Energy (EDE) model in light of recent cosmological datasets from Planck, the South Pole Telescope (SPT), and the Atacama Cosmology Telescope (ACT), as well as BAO data compiled in Sloan Digital Sky Survey Data Release 16. We find that, independent of the CMB datasets, the EDE model parameters are constrained only by the CMB power spectra as precisely and consistently as the flat case in previous work, even with the spatial curvature. We also demonstrate that combining CMB with BAO is extremely powerful to constrain the curvature parameter even with a reduction of the sound-horizon scale in an EDE model, resulting in $Ω_K=-0.0056\pm 0.0031$ in the case of ACT+BAO after marginalizing over the parameters of the EDE model. This constraint is as competitive as the Planck+BAO result in a $Λ$CDM model, $Ω_{K}=-0.0001\pm 0.0018$.
