arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.09129astro-ph.COgr-qchep-ph
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通过测量精细结构常数区分冻结和融化暗能量模型

Distinguishing freezing and thawing dark energy models through measurements of the fine-structure constant

J. M. A. Vilas Boas, D. M. N. Magano, C. J. A. P. Martins, A. Barbecho, C. Serrano

摘要:

绘制暗能量的行为是观测宇宙学的一项紧迫任务。唯象分类将动力学暗能量模型分为冻结和解冻,这取决于暗能量状态方程是接近还是远离$w=p/ρ=-1$。此外,在现实的动力学暗能量模型中,动力学自由度预计将耦合到电磁扇区,导致精细结构常数$α$的变化。我们讨论了区分冻融类模型与当前和即将到来的观测设施,并使用参数化的暗能量状态方程,它可以有任何一种行为,引入Mukhanov作为基准范例的可行性。我们说明了如何冻结和解冻模型导致不同的红移依赖性的$α$,并使用当前的天体物理观测和本地实验相结合,以约束这一类的模型,提高了关键耦合参数的约束超过两个因素,尽管考虑了更广泛的参数空间比以前的研究中使用的。我们还简要讨论了未来的设施和评论的实际限制这一类的参数化预期的改进。特别是,我们表明,足够敏感的数据可以区分冻结和解冻模型,至少如果一个假设相关的参数空间不包括幻影暗能量模型。

英文摘要:

Mapping the behaviour of dark energy is a pressing task for observational cosmology. Phenomenological classification divides dynamical dark energy models into freezing and thawing, depending on whether the dark energy equation of state is approaching or moving away from $w=p/ρ=-1$. Moreover, in realistic dynamical dark energy models the dynamical degree of freedom is expected to couple to the electromagnetic sector, leading to variations of the fine-structure constant $α$. We discuss the feasibility of distinguishing between the freezing and thawing classes of models with current and forthcoming observational facilities and using a parametrisation of the dark energy equation of state, which can have either behaviour, introduced by Mukhanov as fiducial paradigm. We illustrate how freezing and thawing models lead to different redshift dependencies of $α$, and use a combination of current astrophysical observations and local experiments to constrain this class of models, improving the constraints on the key coupling parameter by more than a factor of two, despite considering a more extended parameter space than the one used in previous studies. We also briefly discuss the improvements expected from future facilities and comment on the practical limitations of this class of parametrisations. In particular, we show that sufficiently sensitive data can distinguish between freezing and thawing models, at least if one assumes that the relevant parameter space does not include phantom dark energy models.

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