报告题目 (Title)：Cosmic Microwave Background constraints on Non-commutative spacetime
（非对易时空的宇宙微波背景辐射限制）
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
报告地点 (Place)：校本部 G313
邀请人 (Inviter)：尹璐
主办部门：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.