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arXiv 2301.03572astro-ph.COgr-qchep-phhep-th
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来自Alpha吸引子的非振荡早期暗能量与精质模型

Non-oscillating Early Dark Energy and Quintessence from Alpha-Attractors

Lucy Brissenden, Konstantinos Dimopoulos, Samuel Sánchez López

AI总结:

本文提出一种基于alpha吸引子动力学极点的非振荡标量场模型,无需额外微调即可同时解释早期暗能量与晚期暗能量,且因衰减更快而与观测更吻合。

摘要:

早期暗能量(EDE)是解决哈勃张力——即早期与晚期宇宙对哈勃常数测量之间的差异——最有前景的可能性之一。在本文中,我们提出了一个标量场模型,该模型能够以联合方式同时解释EDE和晚期暗能量(DE),且无需额外的微调。该场具有类似于alpha吸引子的动力学极点。我们的模型在物质-辐射相等时期附近注入EDE,随后通过自由下落迅速红移衰减,之后重新冻结,在今天成为晚期暗能量。利用文献中对EDE当前约束的合理估计,我们发现参数空间虽然狭窄但可行。因此,我们的模型很容易被证伪。与其他EDE研究相比,我们的模型是非振荡的,这使其衰减速度比通常的振荡型EDE更快,从而与观测结果达到更好的一致性。

英文摘要:

Early dark energy (EDE) is one of the most promising possibilities in order to resolve the Hubble tension: the discrepancy between early and late-Universe measurements of the Hubble constant. In this paper we propose a model of a scalar field which can explain both EDE and late Dark Energy (DE) in a joined manner without additional fine-tuning. The field features kinetic poles as with alpha-attractors. Our model provides an injection of EDE near matter-radiation equality, and redshifts away shortly after via free-fall, later refreezing to become late-time DE at the present day. Using reasonable estimates of the current constraints on EDE from the literature, we find that the parameter space is narrow but viable. As such our model is readily falsifiable. In contrast to other work in EDE, our model is non-oscillatory, which causes its decay to be faster than that of the usual oscillatory EDE, thereby achieving better agreement with observations.

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。

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