arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1906.08261astro-ph.COhep-phhep-th
收藏

$H_0$张力、沼泽地猜想和暗物质衰落时代

$H_0$ Tension, Swampland Conjectures and the Epoch of Fading Dark Matter

Prateek Agrawal, Georges Obied, Cumrun Vafa

摘要:

受沼泽地dS猜想的启发,我们考虑一个滚动标量场作为暗能量的来源。此外,沼泽地距离猜想表明,滚动场将导致在后期的指数轻塔的国家。将这座塔确定为位于暗区表明标量场与暗物质的自然耦合,导致在最近的宇宙学时代,随着标量场的滚动,暗物质质量不断减少。距离猜想中的指数$\tilde{c}$应该是一个$\mathcal{O}(1)$数。有趣的是,当我们包括$H_0$的局部测量时,我们的模型更喜欢耦合$\tilde{c}$的非零值,其显著性为$2.8σ$,最佳拟合为$\tilde{c} \sim 0.3$。与$Λ$ CDM相比,以这种方式修改宇宙的最近演化改进了在$2σ$水平上对数据的拟合。这个受弦启发的模型自动降低了$H_0$测量和$σ_8$测量中的宇宙学张力。

英文摘要:

Motivated by the swampland dS conjecture, we consider a rolling scalar field as the source of dark energy. Furthermore, the swampland distance conjecture suggests that the rolling field will lead at late times to an exponentially light tower of states. Identifying this tower as residing in the dark sector suggests a natural coupling of the scalar field to the dark matter, leading to a continually reducing dark matter mass as the scalar field rolls in the recent cosmological epoch. The exponent in the distance conjecture, $\tilde{c}$, is expected to be an $\mathcal{O}(1)$ number. Interestingly, when we include the local measurement of $H_0$, our model prefers a non-zero value of the coupling $\tilde{c}$ with a significance of $2.8σ$ and a best-fit at $\tilde{c} \sim 0.3$. Modifying the recent evolution of the universe in this way improves the fit to data at the $2σ$ level compared to $Λ$CDM. This string-inspired model automatically reduces cosmological tensions in the $H_0$ measurement as well as $σ_8$.

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。

↑