Title: High-quality axions in a class of chiral U(1) gauge theories

Speaker: Yu-Cheng Qiu (SJTU)

Time: Oct 19 (Thursday) 2pm

Location: 理科楼C302

Abstract:

There are many candidates for the quintessence and/or the QCD axions in a class of chiral U(1) gauge theories. Their qualities are high enough to serve as the dark energy and/or to solve the strong CP problem. Interestingly, the high quality of axion is guaranteed by the gauged U(1) and Z2N symmetries and hence free from the non-perturbative quantum gravity corrections. Furthermore, this mechanism can be easily applied to the Fuzzy dark matter axion scenarios. Interestingly, the introduction of extra dimension would drastically simplify the model.

Bio:

Dr. Qiu Yu-cheng graduated from Soochow University with his bachelor’s degree in 2017 followed by his PhD in The Hong Kong University of Science and Technology in 2022. Currently he holds a postdoctoral position at Tsung-Dao Lee Institute at Shanghai Jiao Tong University. His research mainly focuses on particle theory and cosmology, with special interests in baryon-number violation, cosmological tensions and string compactification phenomenology. Recently, he works on the axion quality problem and neutrino mixing.