j9九游会

报告问题 (Title)：Cosmic Microwave Background constraints on Non-commutative spacetime

（非对易时空的宇宙微波配景辐射限制）

报告人 (Speaker)：Dr. Joby Kochappan（印度马尼帕尔自然科学中心）

报告时间 (Time)：2025年9月26日(周五) 10:30-11:30

报告所在 (Place)：校本部 G313

约请人 (Inviter)：尹璐

主理部分：理学院物理系

摘要 (Abstract)：

String theory suggests that spacetime may be non-commutative at length scales close to the Planck length. If this is true, then inflation possibly stretches out such scales to detectable sizes in cosmological observations. In this talk, I will discuss our current efforts to search for the signature of non-commutative spacetime in Cosmic Microwave Background (CMB) data. Using the CMB data from Planck2018, we find a factor of three improvement compared to the previous constraints from Planck2013 data. I will also talk about the existing systematics and challenges that we face in this pursuit.