| 非微扰的极早期宇宙现象学: 共振的原初扰动与非高斯尾巴 |
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| 引用本文： | 蔡一夫,何鑫宸,马潇汉.非微扰的极早期宇宙现象学: 共振的原初扰动与非高斯尾巴[J].天文学报,2024,65(3):23. |
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| 作者姓名： | 蔡一夫 何鑫宸 马潇汉 |
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| 作者单位： | 中国科学技术大学物理学院天文学系 合肥 230026;深空探测实验室 合肥 230026%中文单位待添加 |
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| 基金项目： | 科技部国家重点研发计划(2021YFC2203100)、国家自然科学基金项目(12261131497)、中国科学院青年交叉团队项目(JCTD-2022-20)、111基地项目(B23042)、中国科学院基础研究领域青年团队项目(YSBR-006)资助 %({\bmseries \colorred此处为经费资助, 机构、个人为论文研究工作提供的相应实验条件、软件或数据支持及讨论建议等非经费资助请放在文末致谢位置}) |
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| 摘 要： | 在精确宇宙学的时代, 多信使、高精度、小尺度的宇宙学观测在帮助人们从更加深刻的层面理解宇宙极早期的同时, 也给基于线性近似和微扰展开宇宙学扰动理论带来了新的挑战. 近年来, 对原初引力波和原初黑洞的搜寻使得研究人员们对早期宇宙在小尺度上的非线性非微扰过程产生了浓厚的研究兴趣. 综述了在宇宙学小尺度上关于原初黑洞产生以及引力波研究取得的诸多进展, 重点关注了使用Mathieu方程的共振效应来研究小尺度功率谱放大以及诱导产生可观测的原初引力波的方法. 此外, 还尝试探讨了非高斯尾巴对原初黑洞形成的影响. 发现Mathieu方程所具备的共振效应可以提供一种有效的方法来刻画原初宇宙中小尺度的非微扰动力学过程, 从而能够更好地理解原初黑洞的形成以及相关的引力波产生机制. 同时, 非微扰的非高斯性在原初黑洞形成中可能会产生不可忽视的影响.
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| 关 键 词： | 宇宙学: 暴胀理论 早期宇宙 原初引力波 非高斯性 原初黑洞 |
| 收稿时间： | 2023/8/4 0:00:00 |
Nonperturbative Phenomenons of the Very Early Universe: Resonances in Primordial Fluctuations and Non-Gaussian Tails |
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| CAI Yi-fu,HE Xin-chen,MA Xiao-han.Nonperturbative Phenomenons of the Very Early Universe: Resonances in Primordial Fluctuations and Non-Gaussian Tails[J].Acta Astronomica Sinica,2024,65(3):23. |
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| Authors: | CAI Yi-fu HE Xin-chen MA Xiao-han |
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| Institution: | School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026;Deep Space Exploration Laboratory/Department of Astronomy, School of Physical Sciences, University of Science and Technology of China, Hefei 230026 |
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| Abstract: | In the era of precision cosmology, multi-messenger, high-resolution as well as small-scale cosmological observations have provided profound insights into the early universe, while also presenting new challenges to cosmological perturbation theory based on linear approximation and perturbative expansions. In recent years, the search for primordial gravitational waves and primordial black holes has generated significant research interest in the non-linear and non-perturbative processes in the early universe at small scales. This review paper summarizes the progress in understanding the generation of primordial black holes and gravitational waves at cosmological small scales. Specifically, we focus on the application of the resonance effect depicted by the Mathieu equation to study small-scale power spectrum amplification and the induction of observable primordial gravitational waves. Furthermore, we attempt to explore the influence of non-Gaussian tails on primordial black hole formation. Our findings indicate that the resonance effect of the Mathieu equation provides an effective approach to describe non-perturbative and non-linear processes at small scales in the early universe, leading to a better understanding of the mechanisms behind primordial black hole formation and gravitational wave generation. Additionally, the non-perturbative non-Gaussianity may have a significant impact on the formation of primordial black holes. |
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| Keywords: | cosmology: inflation early universe primordial gravitational waves non-Gaussianity primordial black holes |
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