Georg Raffelt, Max-Planck-Institut für Physik, München, Germany Escuela Avanzada de Verano, 7-11 July 2008, Cinvestav, Mexico-City Some Dark Matter Candidates Supersymmetric particles Neutralinos Neutralinos Axinos Axinos Gravitinos Gravitinos Gauge hierarchy problem Little Higgs models Kaluza-Klein excitations Large extra dimensions Axions CP Problem of strong interactions Sterile neutrinos Right-handes states should exist Wimpzillas (superheavy particles) Super GZK cosmic rays MeV-mass dark matter Explain cosmic-ray positrons Mirror matter Exact parity symmetry Primordial black holes Q-balls Why not