Title: Gravitational Waves from Reheating: Messengers of the Pre-BBN Universe
时间：2025年6月23日(周一), 10:00
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报告人:徐勇 博士 【德国美因茨大学】
邀请人：张永超
Abstract: The well-established theory of Big Bang Nucleosynthesis (BBN) implies that our universe must have been thermalized prior to this epoch. However, cosmic inflation leaves the universe cold and dominated by vacuum energy at its end. The subsequent reheating phase, which connects inflation to the radiation-dominated era preceding BBN, plays a pivotal role in shaping the universe’s thermal history. This transition impacts key processes such as dark matter production, cosmic phase transitions, and baryogenesis. Despite its significance, the reheating era remains one of the most observationally challenging epochs in cosmology. In this talk, I will present recent advances in the study of stochastic gravitational waves (GWs) generated directly during reheating through graviton emission. I will demonstrate how the resulting GW background, as part of the landscape of cosmic messengers, offers a unique and direct probe of the pre-BBN universe.
报告人简介: 徐勇，2022年博士毕业于德国波恩大学，目前在德国美因茨大学、Mainz Institute for Theoretical Physics (MITP)担任博士后，主要从事粒子和宇宙学交叉领域研究。研究内容包括早期宇宙暴胀的粒子物理模型构建、再加热阶段的动力学分析、引力子产生所诱导的引力波理论计算推进，以及早期宇宙中暗物质生成与重子不对称起源新机制的探索。迄今发表研究论文24篇，近期荣获加拿大麦吉尔大学Trottier Space Institute Fellowship (2025年10月起)。