Determining the Hubble constant without the sound horizon scale: measurements from CMB lensing

Determining the Hubble constant without the sound horizon scale: measurements from CMB lensing
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在没有声视界标度的情况下确定哈勃常数:CMB 透镜测量

DOI:
10.1093/mnras/staa3706
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发表时间:
2021
影响因子:
4.8
通讯作者:
Baxter E
Baxter E
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Baxter E

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如果假设一个平坦的Λ冷暗物质(ΛCDM)宇宙学模型,那么从宇宙距离阶梯测量哈勃常数H 0,目前与从普朗克宇宙微波背景辐射(CMB)观测和其他高红移数据集推断的值存在矛盾。这种张力的少数几个有希望的理论解决方案之一是调用新的物理学,改变早期宇宙中的声视界尺度;这可以使CMB和重子声振荡(BAO)对H 0的约束与局部测量更好地吻合。本文讨论了如何在不利用声视界标度rs的情况下,从CMB测量哈勃常数。特别是,我们展示了如何测量的CMB透镜功率谱可以放置有趣的约束onH 0时,结合测量的超新星或星系弱透镜,约束物质密度参数。这些限制来自于宇宙微波背景辐射透镜功率谱在物质辐射相等(投影)时对视界尺度的敏感性;这个尺度对新物理的依赖性可能不同于对声音视界的依赖性。通过对普朗克超新星和万神殿超新星的CMB透镜观测数据的分析,我们得到了一个rs独立的约束条件。对未来CMB调查的预测表明,改善约束超出误差的CMB透镜将是困难的,虽然应用类似的方法,星系功率谱可能会允许进一步的改进。
Measurements of the Hubble constant,H0, from the cosmic distance ladder are currently in tension with the value inferred fromPlanckobservations of the cosmic microwave background (CMB) and other high-redshift data sets if a flat Λ cold dark matter (ΛCDM) cosmological model is assumed. One of the few promising theoretical resolutions of this tension is to invoke new physics that changes the sound horizon scale in the early Universe; this can bring CMB and baryon acoustic oscillations (BAO) constraints onH0into better agreement with local measurements. In this paper, we discuss how a measurement of the Hubble constant can be made from the CMBwithoutusing information from the sound horizon scale,rs. In particular, we show how measurements of the CMB lensing power spectrum can place interesting constraints onH0when combined with measurements of either supernovae or galaxy weak lensing, which constrain the matter density parameter. The constraints arise from the sensitivity of the CMB lensing power spectrum to the horizon scale at matter–radiation equality (in projection); this scale could have a different dependence on new physics than the sound horizon. From an analysis of current CMB lensing data fromPlanckand Pantheon supernovae with conservative external priors, we derive anrs-independent constraint of. Forecasts for future CMB surveys indicate that improving constraints beyond an error ofwill be difficult with CMB lensing, although applying similar methods to the galaxy power spectrum may allow for further improvements.
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发表时间: 2020-05-01
影响因子: 6.4
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DOI: --
发表时间: 2022
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