报告题目：axion Lambda CDM (aLCDM)

报告人：Dr. Yu-Cheng Qiu （Tsung-Dao Lee Institute, Shanghai Jiao Tong University ）

报告摘要：Here I present a framework named aLCDM to explain recently reported cosmological anomalies, including dynamical dark energy and isotropic cosmic birefringence. We introduces an ultralight axion field under the LCDM model. The cosmic evolution of the axion explains the dynamics of the dark energy and give rise to cosmic birefringence through Chern-Simons-type coupling. Combing the recent BAO data collected by DESI and DES, we find that there is a prefence in the negative cosmological constant scenario, which shall result in a crunch in the future. We estimate the lifespan of our universe to be 34 billion years.

报告时间：2025年7月1日（周二）15:30

报告地点：仙林园区3-402室

欢迎大家参加！