[论文解读] Modified Gravity and Cosmology: An Update by the CANTATA Network

Emmanuel N. Saridakis, Ruth Lazkoz+51 more|arXiv (Cornell University)|May 20, 2021

Cosmology and Gravitation Theories参考文献 73被引用 167

一句话总结

关于修正引力与宇宙学的最新进展的综合性综述，概述理论一致性检查、背景与扰动预测，以及与观测数据的对比。它总结了可行的理论和未来方向。

ABSTRACT

General Relativity and the $Λ$CDM framework are currently the standard lore and constitute the concordance paradigm. Nevertheless, long-standing open theoretical issues, as well as possible new observational ones arising from the explosive development of cosmology the last two decades, offer the motivation and lead a large amount of research to be devoted in constructing various extensions and modifications. All extended theories and scenarios are first examined under the light of theoretical consistency, and then are applied to various geometrical backgrounds, such as the cosmological and the spherical symmetric ones. Their predictions at both the background and perturbation levels, and concerning cosmology at early, intermediate and late times, are then confronted with the huge amount of observational data that astrophysics and cosmology are able to offer recently. Theories, scenarios and models that successfully and efficiently pass the above steps are classified as viable and are candidates for the description of Nature. This work is a Review of the recent developments in the fields of gravity and cosmology, presenting the state of the art, high-lighting the open problems, and outlining the directions of future research. Its realization was performed in the framework of the COST European Action ``Cosmology and Astrophysics Network for Theoretical Advances and Training Actions''.

研究动机与目标

• 推动超越广义相对论和 ΛCDM 的引力与宇宙学探索。
• 总结扩展引力理论的理论一致性标准。
• 回顾在整个人类宇宙历史中的背景演化与扰动的预测。
• 对通过理论和观测可行性检验的可行模型进行分类。
• 在 COST 网络框架内概述尚未解决的问题与未来研究方向。

提出的方法

• 调查并综合修正引力与宇宙学的理论框架。
• 将理论与一致性标准及几何背景（宇宙学与球对称性）进行评估。
• 在背景和扰动水平上比较预测与早期、中期、晚期的观测数据。
• 识别通过理论与观测检验的可行模型。
• 在 CANTATA 网络框架内突出未解决的问题与未来研究议程。

实验结果

研究问题

• RQ1 修正引力理论的理论一致性要求是什么？
• RQ2 扩展引力理论如何修改背景宇宙学和宇宙学扰动？
• RQ3 在不同纪元的观测数据面前，哪些模型仍然可行？
• RQ4 引力与宇宙学领域的主要未解问题及未来研究方向是什么？

主要发现

• 本研究提供了关于引力与宇宙学发展的一流综述。
• 它强调对理论一致性、背景行为和扰动进行理论检验的过程。
• 综述确定通过这些检验的理论和情境，作为描述自然界的可行候选者。
• 本文强调尚未解决的问题并在 COST European Action 框架内概述未来研究方向。
• 该更新汇集了到 2023 年为止文献中提出的广泛模型与方法。