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arXiv 2009.08455astro-ph.CO
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由BAO确定声视界和哈勃常数的不依赖于折射率的方法

Recombination-independent determination of the sound horizon and the Hubble constant from BAO

Levon Pogosian, Gong-Bo Zhao, Karsten Jedamzik

备注：
8 pages, 4 figures, 2 tables; v2: minor revisions, references added, matches the version accepted to Ap J Lett
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摘要：

哈勃张力和试图解决它通过修改物理的（或在）重组激励寻找方法来确定$H_0$和声音视界在重子去耦$r_{\rm d}$的方式，既不依赖于重组模型，也不依赖于后期哈勃数据的时代。在这项工作中，我们调查可以从当前和未来的BAO数据时，治疗$r_{\rm d}$和$H_0$作为独立的自由参数。众所周知，BAO对产品$r_{\rm d}H_0$给出了精致的约束。我们在这里表明，施加一个温和的前$Ω_{\rm m} h^2$打破了$r_{\rm d}$和$H_0$之间的退化。使用最新的BAO数据，包括最近发布的eBOSS DR 16，以及基于普朗克最佳拟合$Λ$ CDM模型的$Ω_{\rm m} h^2$先验，我们发现$r_{\rm d} =143.7 \pm 2.7$ Mpc和$H_0 = 69.6 \pm 1.8$ km/s/Mpc。因此，BAO数据比在$Λ$ CDM模型中从普朗克数据推断的数据更倾向于稍低的$r_{\rm d}$和稍高的$H_0$。我们发现类似的值时，结合BAO与万神殿超新星，DES星系弱透镜，普朗克或SPTPol CMB透镜和宇宙计时器的数据。我们进行了预测DESI，发现，当一个温和的前辅助$Ω_{\rm m} h^2$，DESI将测量$r_{\rm d}$和$H_0$没有假设一个重组模型的准确性超过目前最好的估计普朗克。

英文摘要：

The Hubble tension and attempts to resolve it by modifying the physics of (or at) recombination motivate finding ways to determine $H_0$ and the sound horizon at the epoch of baryon decoupling $r_{\rm d}$ in ways that neither rely on a recombination model nor on late-time Hubble data. In this work, we investigate what one can learn from the current and future BAO data when treating $r_{\rm d}$ and $H_0$ as independent free parameters. It is well known that BAO gives exquisite constraints on the product $r_{\rm d}H_0$. We show here that imposing a moderate prior on $Ω_{\rm m} h^2$ breaks the degeneracy between $r_{\rm d}$ and $H_0$. Using the latest BAO data, including the recently released eBOSS DR16, along with a $Ω_{\rm m} h^2$ prior based on the Planck best fit $Λ$CDM model, we find $r_{\rm d} =143.7 \pm 2.7$ Mpc and $H_0 = 69.6 \pm 1.8$ km/s/Mpc. BAO data therefore prefers somewhat lower $r_{\rm d}$ and higher $H_0$ than those inferred from Planck data in a $Λ$CDM model. We find similar values when combing BAO with the Pantheon supernovae, DES galaxy weak lensing, Planck or SPTPol CMB lensing and the cosmic chronometers data. We perform a forecast for DESI and find that, when aided with a moderate prior on $Ω_{\rm m} h^2$, DESI will measure $r_{\rm d}$ and $H_0$ without assuming a recombination model with an accuracy surpassing the current best estimates from Planck.

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