Speaker
Xiaoyong Chu
(University of Chinese Academy of Sciences)
Description
In the early universe, dark matter (DM) may undergo freeze-out to reach its observed relic abundance. Unlike conventional WIMPs, SIMPs (Strongly Interacting Massive Particles) achieve this via efficient number-changing annihilations, motivated by astrophysical small-scale structure puzzles. However, SIMPs face two critical hurdles: (i) the strong couplings needed for successful freeze-out may break perturbativity, and (ii) kinetic equilibrium with the thermal bath is crucial to dissipate energy. My talk presents our solutions, showing that both issues can be naturally resolved in some dark QCD models.
Author
Xiaoyong Chu
(University of Chinese Academy of Sciences)