$H_0$的较大值是由于引力常量的变化
A larger value for $H_0$ by an evolving gravitational constant
摘要：
我们提供了进一步的证据表明，一个无质量的宇宙标量场与非最小耦合的里奇曲率的类型$M^2_{\rm pl}(1+ξσ^n/M_{\rm pl}^n) $，阐明了现有的紧张局势之间的本地测量的哈勃常数和它的推断从CMB各向异性和重子声学振荡数据中存在的宇宙学常数。在这些模型中，膨胀历史被修改相比，$Λ$ CDM在早期的时间，模仿相对论性物种的有效数量的变化，和重力减弱后，物质辐射平等。与$Λ$ CDM相比，当在分析中使用{ \em Planck} 2018（单独或与BAO和SH 0 ES组合）测量数据时，二次（$n=2$）耦合增加了哈勃常数。负值的耦合，标量场减少，似乎有利于和太阳系的一致性，可以自然地实现大部分的参数空间，而不需要任何屏蔽机制。我们表明，我们的结果是强大的$n$的选择，也提出了$n=4$的分析。
英文摘要：
We provide further evidence that a massless cosmological scalar field with a non-minimal coupling to the Ricci curvature of the type $M^2_{\rm pl}(1+ξσ^n/M_{\rm pl}^n) $ alleviates the existing tension between local measurements of the Hubble constant and its inference from CMB anisotropies and baryonic acoustic oscillations data in presence of a cosmological constant. In these models, the expansion history is modified compared to $Λ$CDM at early time, mimicking a change in the effective number of relativistic species, and gravity weakens after matter-radiation equality. Compared to $Λ$CDM, a quadratic ($n=2$) coupling increases the Hubble constant when {\em Planck} 2018 (alone or in combination with BAO and SH0ES) measurements data are used in the analysis. Negative values of the coupling, for which the scalar field decreases, seem favored and consistency with Solar System can be naturally achieved for a large portion of the parameter space without the need of any screening mechanism. We show that our results are robust to the choice of $n$, also presenting the analysis for $n=4$.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
