解决哈勃张力的一个有吸引力的提议：统一早期与晚期暗能量的动力学吸引子
An Attractive Proposal for Resolving the Hubble Tension: Dynamical Attractors that Unify Early and Late Dark Energy
AI总结：
针对早期暗能量需精细调节初始条件的问题，本文提出以动力学鞍点和晚期吸引子统一早期与晚期暗能量的单标量框架，并通过基准模型揭示其与宇宙学数据的冲突及建模启示。
摘要：
早期暗能量是解决哈勃张力的一种有潜力的方案。遗憾的是，许多模型都需要精细调节初始条件，以确保早期暗能量的时期与物质—辐射相等时期重合。我们提出了一类有吸引力的早期暗能量模型，其中这种重合自然地作为动力学系统的一个鞍点出现，该鞍点吸引相空间中大量轨迹，而与初始条件无关。该系统在晚期趋近于一个全局暗能量吸引子。因此，我们的框架利用单一标量自由度统一了早期与晚期暗能量。我们分析了一个基准有吸引力早期暗能量模型，发现它不被宇宙学数据支持，原因是物质时期存在一个长寿命鞍点，在该鞍点处标量扮演额外的（非成团）暗物质组分的角色。我们的研究为未来旨在构建可行的有吸引力早期暗能量模型的建模工作提供了经验。
英文摘要：
Early dark energy is a promising potential resolution of the Hubble tension. Unfortunately, many models suffer from the need to fine-tune their initial conditions to ensure that the epoch of early dark energy coincides with matter-radiation equality. We propose a class of attractive early dark energy models where this coincidence arises naturally as a saddle point of a dynamical system that attracts a large volume of phase-space trajectories regardless of the initial conditions. The system approaches a global dark energy attractor at late-times. Our framework therefore unifies early and late dark energy using a single scalar degree of freedom. We analyze a fiducial attractive early dark energy model and find that it is disfavored by cosmological data due to the presence of a long-lived saddle point in the matter era where the scalar plays the role of an additional component of (non-clustering) dark matter. Our investigations provide lessons for future model-building efforts aimed at constructing viable attractive early dark energy models.
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