Even in the total absence of thermal kinetic energy, fermionic dark matter must have nonzero momentum due to the Pauli degeneracy pressure. As the fermions were inevitably denser at higher redshifts, a typical fermion may gain a fermi momentum that can exceed its mass. I will talk about the impacts of the transition between nonrelativistic and relativistic behaviour, as revealed by...
While particle dark matter is often modeled or presented as being a single species of matter, it is possible that dark matter is a part of a larger dark sector that may contain additional dark particles and dark forces. Such a scenario gives rise to rich phenomenology and can have a significant impact on astrophysical and cosmological observables. Furthermore, if the dark sector is secluded...
