Phenomenological and Astroparticle

The Dark Matter problem is one of the most relevant quests for the understanding of the elementary constituents of the Universe: the nature of the Dark Matter is still unveiled. Experimental efforts aiming to detect the Dark Matter have shown a great progress in the last decade. This work is devoted to the phenomenological and astroparticle studies of Dark Matter candidates of supersymmetric nature –the neutralino– and beyond –scalar particles. The former, in the (1−100) GeV mass range, is currently being tested by the Large Hadron Collider, direct detection and indirect detection experiments; this work shows that the interplay between experimental techniques is a decisive tool to thoroughly search for theoretical predictions. The latter is a non-standard candidate as light as 1 MeV which could be copiously produced at the Large Hadron Collider and, at the same time, it could explain other phenomena such as neutrino masses and/or the 511 keV line from the galactic center of the Milky Way. te l-0 06 32 61 8, v er si on 2 2 N ov 2 01 1