GRAVITINO AND SUPERWIMPS IN COSMOLOGY

We will review models of Dark Matter, where the particle interacts much more weakly than weak, also called SuperWIMPs or E-WIMPs models. One particularly very well known candidate of this type is the gravitino, but also other well-motivated particles are the axino, a sterile neutrino or a particle of the hidden sector with GUT suppressed interaction with normal matter, etc. These candidates have a very different phenomenology than candidates of the weakly interacting type, i.e. WIMPs (Weakly-Interacting Massive Particles), but they can still be produced in cosmology in sufficient number to provide the measured Dark Matter density. Moreover, if they are connected to a larger sector of SM-charged new particles, like in the case of supersymmetric models, they can provide interesting alternative signatures at colliders. DOI:10.5506/APhysPolB.43.2225