arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2011.10559astro-ph.CO
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从第一原理看哈勃速度

A look at the Hubble speed from first principles

Fabrizio Renzi, Alessandra Silvestri

摘要:

我们介绍了一种新的方法来测量$H_0$从一个独立的几何数据集的组合,既不需要校准,也没有选择的宇宙学模型。我们建立在{ \it距离对偶关系}的基础上,该关系将光度和角直径距离的比率设置为具有标准光子传播的任何引力度规理论的红移的固定标度,并构成描述我们宇宙的任何理论的基础。我们的方法提供了前所未有的可能性,确定$H_0$从第一原则,释放测量这个基本常数从校准和假设的宇宙学模型。我们在$68\%$ C. L.处发现了$H_0=69.5 \pm 1.7$ km/s/Mpc。表明哈勃常数可以在最小假设下被限制在百分比水平。

英文摘要:

We introduce a novel way of measuring $H_0$ from a combination of independent geometrical datasets, with no need of calibration nor of the choice of a cosmological model. We build on the {\it distance duality relation} which sets the ratio of the luminosity and angular diameter distance to a fixed scaling in redshift for any metric theory of gravity with standard photon propagation and constitutes a founding block of any theory describing our Universe. Our method provides the unprecedented possibility of determining $H_0$ from first principles, unleashing the measurement of this fundamental constant from calibration and assumption of a cosmological model. We find $H_0=69.5 \pm 1.7$ km/s/Mpc at $68\%$ C.L. showing that the Hubble constant can be constrained at percent level with minimal assumptions.

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