题目：Constraining Quintessence Modelswith ISW-tSZ Cross-Correlations: Thawing Tracker,and Scaling-Freezing Dynamics in the Context of Stellar Feedbackand Cosmic Ray Propagation
主讲人：Ayodeji lbitoye 研究员
时间：2025年9月25日(周四)14:00-16:00
腾讯会议号：919-547-550
主持人：OLOKETUYI JACOB OLADEJI 博士后
简历：Ayodeji lbitoye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 lbitoye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。
摘要：The nature of dark energy remains a central mystery in cosmology. While LCDMprovides a robust framework, dynamical alternatives such as quintessence offer testabledeviations. In this talk, l will present constraints on three quintessence models-thawing,tracker, and scaling-freezing using the first detection of the Integrated Sachs-Wolfe(1SW)-thermal Sunyaev-Zeldovich (tSZ) cross-correlation (lbitoye et al. 2024). Beyond darkenergy, our results reveal connections between large-scale structure and stellar feedbackgas pressure profiles, and magnetic fields that may influence both the tSZ signal and cosmicray propagation paralleling processes seen in solar system plasmas. While focused orcosmology, this work opens pathways for multi-scale joint analyses combining cosmologicaland even heliophysical datasets to simultaneously probe dark energy and the physics ofcosmic baryons.
