论文标题

耦合和未耦合的早期暗能量,巨大的中微子和宇宙张力

Coupled and uncoupled early dark energy, massive neutrinos and the cosmological tensions

论文作者

Gómez-Valent, Adrià, Zheng, Ziyang, Amendola, Luca, Wetterich, Christof, Pettorino, Valeria

论文摘要

一些具有不可忽略的暗能量分数的宇宙学模型,特别是预聚类时期的窗户,能够非常有效地减轻哈勃张力,同时保持对用于构建宇宙逆距离距离梯子的数据的良好描述。社区中已经进行了深入的讨论,即这些模型是否增强了物质波动的力量,从而使{\ IT事实上}通过大规模的结构测量来使紧张局势恶化。我们在几个早期的暗能量(EDE)模型的背景下解决了这个关键问题,在某些情况下也考虑了暗能和暗物质之间的耦合以及大规模中微子的效果。我们使用Planck 2018的可能性,Pantheon汇编的IA型超新星以及Baryon声学振荡的数据适合它们。我们发现,超轻轴承(ULA)EDE实际上可以减轻$ H_0 $张力,而无需增加$σ_{12} $的值,相对于$λ$ CDM的值,而具有指数性潜力的EDE对紧张局势没有任何影响。黑暗扇区中的耦合倾向于增强物质的聚类,并且数据限制了大量中微子的影响,因为其质量之和其质量之和的上限太接近了标准模型中获得的质量。我们发现,在最好的情况下,即Ula,哈勃张力将减少到$ \ sim2σ$。

Some cosmological models with non-negligible dark energy fractions in particular windows of the pre-recombination epoch are capable of alleviating the Hubble tension quite efficiently, while keeping the good description of the data that are used to build the cosmic inverse distance ladder. There has been an intensive discussion in the community on whether these models enhance the power of matter fluctuations, leading {\it de facto} to a worsening of the tension with the large-scale structure measurements. We address this pivotal question in the context of several early dark energy (EDE) models, considering also in some cases a coupling between dark energy and dark matter, and the effect of massive neutrinos. We fit them using the Planck 2018 likelihoods, the supernovae of Type Ia from the Pantheon compilation and data on baryon acoustic oscillations. We find that ultra-light axion-like (ULA) EDE can actually alleviate the $H_0$ tension without increasing the values of $σ_{12}$ with respect to those found in the $Λ$CDM, whereas EDE with an exponential potential does not have any impact on the tensions. A coupling in the dark sector tends to enhance the clustering of matter, and the data limit a lot the influence of massive neutrinos, since the upper bounds on the sum of their masses are too close to those obtained in the standard model. We find that in the best case, namely ULA, the Hubble tension is reduced to $\sim 2σ$.

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