西南交通大学 物理科学与技术学院

创源大讲堂 格物致理讲坛    第98期

Constraining Quintessence Models with ISW–tSZ Cross-Correlations: Thawing, Tracker, and Scaling-Freezing Dynamics in the Context of Stellar Feedback and Cosmic Ray Propagation

学术主持：OLOKETUYI JACOB OLADEJI  博士后

时间： 2025年9月25号（周四）14:00-16:00

会议形式：仅线上

腾讯会议号：919-547-550

Ayodeji Ibitoye在广东以色列理工学院（GTIIT）物理学项目的宇宙学和天体物理学小组担任研究员。

曾在中国科学院国家天文台（北京）做博士后研究员。曾是 ANSO 大型科学设施访问学者（2022 和 2024 年）和汕头市高层次人才项目的获得者。并于2021 年 5 月，在南非夸祖鲁-纳塔尔大学获得宇宙学博士学位，其导师是马寅哲教授。Ayodeji Ibitoye的研究兴趣涵盖河外天文学，重点关注宇宙结构的形成和演化、太阳和局部宇宙物理学，以及替代引力理论的观测检验的发展。

报告内容简要：

The nature of dark energy remains a central mystery in cosmology. While LCDM provides a robust framework, dynamical alternatives such as quintessence offer testable deviations. In this talk, I will present constraints on three quintessence models—thawing, tracker, and scaling-freezing using the first detection of the Integrated Sachs-Wolfe (ISW)–thermal Sunyaev-Zeldovich (tSZ) cross-correlation (Ibitoye et al. 2024). Beyond dark energy, our results reveal connections between large-scale structure and stellar feedback, gas pressure profiles, and magnetic fields that may influence both the tSZ signal and cosmic ray propagation paralleling processes seen in solar system plasmas.  While focused on cosmology, this work opens pathways for multi-scale joint analyses combining cosmological, and even heliophysical datasets to simultaneously probe dark energy and the physics of cosmic baryons.