Kaluza-Klein FIMP Dark Matter in Warped Extra-Dimensions
  We study for the first time the case in which Dark Matter (DM) is made of
Feebly Interacting Massive Particles (FIMP) interacting just gravitationally
with the standard model particles in an extra-dimensional Randall-Sundrum
scenario. We assume that both the dark matter and the standard model are
localized in the IR-brane and only interact via gravitational mediators, namely
the graviton, the Kaluza-Klein gravitons and the radion. We found that in the
early Universe DM could be generated via two main processes: the direct
freeze-in and the sequential freeze-in. The regions where the observed DM relic
abundance is produced are largely compatible with cosmological and collider
bounds.
