Fun from None: Deformed Symmetries and Fock Space.

We give a pedagogical introduction to the basics of deformations of relativistic symmetries and the Hilbert spaces of free quantum fields built as their representations. We focus in particular on the example of a κ-deformed scalar quantum field for which the generators of spatial translations that label the field modes act according to a deformed Leibniz rule. We explore the richer structure of the κ-Fock space and point out possible physical consequences of the deformation. [ABSTRACT FROM AUTHOR]