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arXiv 2602.02646gr-qcastro-ph.COhep-th
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大爆炸场景的涌现

The emergent Big Bang scenario

Central European Institute for Cosmology and Fundamental Physics (CEICO), Institute of Physics of the Czech Academy of Sciences（捷克科学院物理研究所中欧宇宙学与基础物理研究所）；Yukawa Institute for Theoretical Physics, Kyoto University（京都大学汤川理论物理研究所）；Research Center for the Early Universe (RESCEU), Graduate School of Science, The University of Tokyo（东京大学大学院理学研究系早期宇宙研究中心）；Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study (UTIAS), The University of Tokyo（东京大学前沿研究机构宇宙物理与数学卡弗里研究所）；Institut d’Astrophysique de Paris, UMR-7095 du CNRS（巴黎天体物理研究所法国国家科学研究中心联合研究实验室）；Center for Gravitational Physics and Quantum Information, Yukawa Institute for Theoretical Physics, Kyoto University（京都大学汤川理论物理研究所引力物理与量子信息中心）

Justin C. Feng, Shinji Mukohyama, Jean-Philippe Uzan

备注：
9 pages, 6 figures
发表信息：
Phys.Rev.D 113 (2026) 8, 084025
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AI总结：

本文提出了一种新的理解宇宙奇点的方法，通过在四维黎曼空间中重新表述物理，并利用所有物质场与钟场的相互作用，使洛伦兹度规局部涌现，从而将初始奇点替换为光滑边界。

摘要：

本文提出了一种新的理解宇宙奇点的方法，通过在四维黎曼空间中重新表述物理，并利用所有物质场与钟场的相互作用，使洛伦兹度规局部涌现，从而将初始奇点替换为光滑边界。

英文摘要：

This paper proposes a new avenue for understanding the cosmological singularity. The standard cosmological model contains a generic initial singularity usually referred to as the {\em big bang}. Herein, we present a novel idea to extend the description of our Universe beyond this limit. The proposal relies on rewriting physics in a purely Riemannian, {\em i.e.} locally Euclidean, four-dimensional space and the emergence of Lorentzian patches owing to the interaction of all matter fields to a clock field that is responsible for a signature change. If our Universe is contained within one of these patches, the initial singularity is replaced by a smooth boundary on which the signature of the physical metric flips. In this paper, we first define the model and draw the necessary conditions on its arbitrary functions for solutions to exist. Next, we prove the existence of solutions that lead to an emergent universe with a primordial (almost) de Sitter phase. To finish, we discuss the consequences of this construction for the universe on scales much larger than our observable Universe: a large ``Euclidean sea'' in which Lorentzian islands locally emerge and host an expanding universe potentially similar to ours. While speculative, this scenario has specific features that can be tested, and the present paper sets the basis for further phenomenological investigations.

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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