From SIMP miracles to WIMP dead ends: navigating the freeze out of MeV-mass dark matter

Xiaoyong Chu, Josef Pradler

We summarize here our studies \cite{Chu:2022xuh,Chu:2023jyb,Chu:2024rrv} on two distinct scenarios for MeV-mass thermal dark matter freeze-out. First, we determine the minimal viab…