报告题目 (Title)：Early Dark Energy Models and Cosmological Tensions（早期暗能量模型与宇宙学问题）
报告人 (Speaker)：Prof. Bum-Hoon Lee（韩国西江大学）
报告时间 (Time)：2025年6月17日（周二）10:00-11:30
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)：
Observational
data, such as the Hubble constant (H0) and cosmic birefringence,
challenge the ΛCDM model. The Hubble tension indicates differing
expansion rates between CMB measurements and direct observation of
supernova/Cepheid variable. Cosmic birefringence causes rotation in the
CMB polarization plane. We reanalyze known results that the Ultralight
Axion-like Early Dark Energy (EDE) model with n=3 alleviates Hubble
tension but does not fit CMB EB mode observations satisfactorily. We
emphasize our notice that the CMB EB angular power spectrum's shape is
sensitive to cosmological parameters. In conclusion, we suggest the EDE
model with n=3 aligns well with both cosmic birefringence and Hubble
tension.