论文标题
与BAO的声音范围和哈勃常数无关重组的确定
Recombination-independent determination of the sound horizon and the Hubble constant from BAO
论文作者
论文摘要
哈勃的张力和试图通过修改（或AT）重组的物理学来解决它，以促使寻找方法来确定$ h_0 $的方法和在巴里昂时代取消$ r _ {\ rm d} $的时期的声音范围，以既不依赖重组模型也不依赖于后期的时光潮。在这项工作中，我们研究了当前和未来的BAO数据时可以从当前和未来的BAO数据中学到的东西，而将$ r _ {\ rm d} $和$ h_0 $作为独立的免费参数。众所周知，BAO对产品$ r _ {\ rm d} H_0 $提供了精致的约束。我们在这里表明，在$ω_ {\ rm m} h^2 $上施加中等先验，破坏了$ r _ {\ rm d} $和$ h_0 $之间的退化。 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.因此，BAO数据更喜欢$ r _ {\ rm d} $和$ h_0 $更高，而$ h_0 $比$λ$ CDM模型中从普朗克数据中推论的$更高。我们在与万神殿超新星，des Galaxy弱透镜，Planck或SPTPOL CMB镜头和宇宙天文钟数据梳理时发现了相似的值。我们对DESI进行了预测，并发现，当在$ω_ {\ rm m} h^2 $上进行中等先验的帮助时，Desi将测量$ r _ {\ rm d} $和$ h_0 $，而无需假设重组模型的重新组合模型准确地超过了当前的最佳估计。
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.
