Manifesting the Imprints of Elastic and Exothermic Scatterings Among Dark Matter Particles in Astrophysical/Cosmological Observations
Heejung Kim (Institute for Basic Science)
In this talk, I will give an overview of how elastic and exothermic scatterings among dark matter particles give rise to distinctive features in late-time structure formation. I will explain how astrophysical observations on the structures of galaxies can probe such unique features, and discuss how the observations can help distinguish different dark matter models. I will then explain how the interplay between the elastic and exothermic scatterings self-heats the overall dark matter in the early Universe. I will demonstrate that self-heating is often realized in scenarios of (sub-)GeV scale non-minimal dark sector. I will discuss how self-heating leaves imprints in cosmological observables and how it affects the interpretation of direct/indirect-detection experiments. Finally, I will discuss how astrophysical/cosmological observations and accelerator-based experiments can be complementary to each other in probing multi-component dark matter scenarios.