Complementaridade em análises de modelos de matéria escura

Abstract

The Dark Matter (DM) remains one of the most important open problems concerning Particle Physics and Cosmology. In face of this problem, we propose extensions of the Standard Model with possible Dark Matter candidates. In the supersymmetric version of the 331 model with right-handed neutrinos, we study the sneutrino as a DM candidate, we compute the relic abundance and scattering cross section in order to compare with the Planck and LUX results, respectively. We found good candidates in the TeV mass scale. Due to lack of WIMP observation in direct and collider experiments, other possible candidates have been extensively studied in the literature. In this sense, we study models with light DM mediated by Dark Photons, we compute different production modes, including thermally and non-thermally. In addition, we compute the annihilation and scattering cross-section in order to compare with results of Planck and XENON, respectively, and, with specific constraints on Dark Photons. We found viable candidates with mass in the MeV scale. Regarding indirect detection, we use Secluded Models, whose DM particles interact with meta-stable mediators that decay into Standard Model particles, to impose strong constraints on the annihilation cross section through experimental data looking for y−ray fluxes due to DM annihilation from Secluded WIMPs in dwarf spheroidal galaxies, using data from Fermi-LAT experiment, and the galactic center, using data from H.E.S.S. experiment. Finally, we analyze whether semi-annihilation models are able to provide a y−ray flux compatible with the excess observed by Fermi-LAT experiment, we found that the channel ME +ME ! ME + h provides a good fit to the data.