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通过宇宙能量密度测量确定哈勃参数的新方法
Alex Krolewski1, Will J Percival1, Alex Woodfinden2
1Perimeter Institute for Theoretical Physics, University of Waterloo, University of Waterloo, Waterloo Centre for Astrophysics, Waterloo, Ontario N2L 3G1, Canada; Department of Physics and Astronomy, Waterloo, Ontario N2L 3G1, Canada; and , 31 Caroline Street North, Waterloo, Ontario NL2 2Y5, Canada.
这项研究提出了一种新的方法来测量哈勃参数,使用大规模结构观测. 新技术提供了精确的哈勃常数 (H0) 测量,与现有数据一致,并与未来的调查进行改进.
科学领域:
- 宇宙学的宇宙学是什么?
- 天体物理学 天体物理学
- 银河系的进化 银河系的进化
背景情况:
- 精确测量哈勃参数 (H0) 对于理解宇宙膨胀速度至关重要.
- 从早期和晚期宇宙观测中得出的H0值之间存在差异.
- 现有的方法通常依赖于移动的声音地平线,引入潜在的系统性不确定性.
研究的目的:
- 引入一种新的,独立的方法来测量哈勃参数 (H0) 使用低红移的大规模结构观测.
- 提供精确的H0测量,独立于移动的声音地平线.
- 评估新测量与现有H0测定的一致性.
主要方法:
- 利用从原始丰富度和大爆炸核合成 (BBN) 获得的 baryons-to-photon比率来确定物理 baryons 密度 (Ωbh2).
- 从银河系聚类数据 (巴里翁振荡光谱调查 - BOSS) 中测量巴里翁分数 (Ωb/Ωm).
- 采用Alcock-Paczynski测试从 baryons声振荡 (BAO) 和空隙来限制几何密度 (Ωm) 并导出H0.0.
主要成果:
- 获得了哈勃参数H0 = 67.1−5.3+6.3 km s−1 Mpc−1 的测量结果.
- 结果在各种分析选择中保持一致,包括测量重子信号的不同方法以及包含/排除超新星和空洞等数据集.
- 导出的H0值与距离梯和宇宙微波背景 (CMB) 测量一致.
结论:
- 新方法提供了对哈勃参数的稳健和独立测量.
- 预计未来的大规模结构调查将大大提高这种H0测量的精度.
- 这种技术为现有的宇宙参数估计方法提供了一种有价值的补充方法.
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