哈勃在低红移沼泽中沉没
Hubble Sinks In The Low-Redshift Swampland
摘要：
哈勃常数$H_0$的局部测定值比普朗克基于CMB和$Λ$ CDM的值更高。通过模型独立的扩展，我们表明，低红移（$z \lesssim 0.7$）的数据，包括重子声学振荡（BAO），宇宙计时器和Ia型超新星有一个较低的$H_0$相对于$Λ$ CDM的精粹模型的偏好。此外，我们证实，指数耦合到暗物质不能改变这一结论在相同的红移范围。我们的结果留下了这样一种可能性，即在物质主导的时代，甚至在黑暗时代，耦合可能会拯救$H_0$，使其免于陷入弦论的沼泽地。
英文摘要：
Local determinations of the Hubble constant $H_0$ favour a higher value than Planck based on CMB and $Λ$CDM. Through a model-independent expansion, we show that low redshift ($z \lesssim 0.7$) data comprising baryon acoustic oscillations (BAO), cosmic chronometers and Type Ia supernovae has a preference for Quintessence models that lower $H_0$ relative to $Λ$CDM. In addition, we confirm that an exponential coupling to dark matter cannot alter this conclusion in the same redshift range. Our results leave open the possibility that a coupling in the matter-dominated epoch, potentially even in the dark ages, may yet save $H_0$ from sinking in the string theory Swampland.
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