Abstract: In this talk, we discuss a series of models that can explain the small-scale observations (potential tensions between cold dark matter simulation and observation). We also discuss the astrophysical studies to test them.
We present models of resonant self-interacting dark matter in a dark sector with QCD, based on analogies to the meson spectra in Standard Model QCD. For dark mesons made of two light quarks, we present a simple model that realizes resonant self-interaction (analogous to the phi-K-K system) and thermal freeze-out. We also consider asymmetric dark matter composed of heavy and light-dark quarks to realize a resonant self-interaction (analogous to the Upsilon (4s)-B-B system) and discuss the experimental probes of both setups. Finally, we comment on the possible resonant self-interactions already built into SIMP and ELDER mechanisms while making use of lattice results to determine feasibility.
These dark matter candidates are interesting because they can be modeled based on meson theories developed in 1970 at Fermilab and U Chicago, and the latest lattice QCD result can also shed light on these models. The talk is based on arXiv:2008.08608 & arXiv:1706.05381.