Elko and Mass Dimension One Fermions: Editorial

Abstract: This editorial presents the quantum field theoretic ambiance in which Elko and mass dimension one fermions come to exist. This may serve not only to introduce Elko, and the associated quantum field, but it may also open a door to a new class of spin one half fermions and bosons. These new particles, as it will be argued in this volume, are first-principle candidates for dark matter.