Mass parametric resonance during QCD phase transition generates substantial fraction of dark matter axions

by Prof. Qiaoli Yang（杨峤立） (Jinan University)

Thursday 9 Oct 2025, 11:00 → 12:00 Asia/Shanghai

Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee Institute)

Abstract: 

Scalar perturbations induce temperature fluctuations during QCD phase transition era. These fluctuations modulate the axion mass, transferring energy into the field through parametric mass resonance, a nonlinear process. This mechanism exhibits substantially unstable regions that could lead to explosive particle productions. Additionally, it does not generate  isocurvature perturbations.

Biography: 

Qiaoli Yang, currently professor of Jinan University, received his bachelor's degree from Nanjing University and his Ph.D. from the University of Florida, under supervision of Prof. Pierre Sikivie (J.J. Sakurai Prize 2020). Qiaoli’s primary research interests are in axion physics and cosmology. Qiaoli was awarded the Gordon and Betty Moore Foundation Fundamental Physics Innovation Awards from APS in 2019. 

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