Speaker
Prof.
Yang Qiaoli
Description
The cosmological abundance of QCD axions is usually attributed to the misalignment mechanism. We will present a complementary production channel that arises during the QCD phase transition. Primordial temperature fluctuations modulate the axion mass and can trigger parametric resonance in the axion field evolution, exciting modes and enhancing axion production. This effect can significantly modify the predicted axion relic abundance and shift the preferred dark-matter mass range, with implications for ongoing and future axion search experiments.
Primary authors
Prof.
Gao Yu
Dr
Pirzada .
Prof.
Yang Qiaoli
