Speaker
Description
We investigate a scenario of Strongly Interacting Massive Particles (SIMPs) where the thermal relic density of dark pion dark matter (DM) is determined by number changing 3→2 annihilations in a strongly interacting dark sector. In this scenario, including dark vector mesons in the hidden local symmetry scheme, we find that dark vector mesons unitarize the dark chiral perturbation theory (ChPT) efficiently and extend the range of validity of the leading order calculations. In QCD-like theories with SU(3)_L×SU(3)_R/SU(3)_V flavor symmetry, we show explicitly that the inclusion of these dark vector mesons in the 3→2 annihilation and 2→2 self-scattering of DM eliminates the tension between the Bullet Cluster bound and the relic density condition in a wide parameter space.
