国台学术报告2023年 第28次
NAOC Colloquium No.28 2023
| 报告题目/Title： | Nonperturbative phenomena of the very early Universe / 极早期宇宙的非微扰现象 |
| 报告人/Speaker： | Prof. Yi-Fu Cai (University of Science and Technology of China) |
| 报告时间/Time： | Tuesday, 2:30 PM, Nov.28, 2023 |
| 报告地点/Location： | The Reading Room @NAOC & Live Streaming on NAOC WeChat Channel |
| 主持人/Host： | Prof. Gongbo Zhao / 赵公博 (NAOC) |
| 报告语言/Language： | English/英文 |
| 报告海报/Poster： | |
| 演示幻灯片/Slides： | Click to view the details (later) |
| 报告视频/Video： | Click to watch the video (later) |
| 直播链接/Live Webcast： | 国台微信公众号视频号 (微信扫描如下二维码） |
| 报告摘要/Abstract： | |
| Today, multi-messenger, high-precision cosmological observations helped us understand the very early Universe better and better. In the meanwhile, several theoretical challenges arise for the developments of cosmological perturbation theory based on the linear approximation. The search for primordial gravitational waves and primordial black holes has drawn more and more attention on the nonperturbative dynamics of the very early Universe at small scales. In this colloquium talk, Prof.Cai will briefly review the latest progresses on the generation of primordial black holes and the induced stochastic gravitational waves at small scales. In particular, he will focus on the resonance effects of primordial fluctuations described by the Mathieu equation and the related application to the enhancement of small-scale power spectrum as well as the observationally accessible primordial gravitational waves. In addition, we also explore the limits of the scalar-induced gravitational waves by virtue of the pulsar timing array observations. These studies lead to potentially new observational window for us to probe new physics within cosmological experiments. | |
| 报告人介绍/Bio: | |
| Yi-Fu Cai is a professor of physics and astronomy at the University of Science and Technology of China. He received the PhD degree in theoretical physics at the Institute of High Energy Physics, Chinese Academy of Sciences in 2010. After that, he worked as a postdoc at Arizona State University and McGill University until 2015. Then, he became a faculty at USTC. His particle cosmology group is responsible for the scientific goals of cosmological observations (e.g. AliCPT). His research focuses on the fundamental questions for physical cosmology including the big bang singularity, the origin and destiny of the Universe, cosmological perturbation theory and the CMB sciences. | |
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