2020/04/02 by Andres D. Perez, Perez, Andres D.
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #High Energy Physics - Phenomenology (hep-ph) #Instrumentation and Methods for Astrophysics (astro-ph.IM)
paper · pdf · doi:10.48550/arxiv.2004.01021
openalex publication_date 2020/04/02 · openalex created_date 2022/07/26 · openalex updated_date 2026/07/28
To elucidate the composition of dark matter (DM) is one of the most important\nopen questions in particle and astroparticle phenomenology. Within the\nframework of minimal supersymmetric extensions of the standard model of\nfundamental particles, the `mu-from-nu supersymmetric standard model',\n\μ\νSSM, solves the \μ-problem and reproduces neutrino data, only adding\ncouplings involving right-handed neutrinos. In this context, the supersymmetric\npartner of the graviton, known as gravitino, becomes a natural DM candidate.\nWorking in the mentioned model, in this thesis we have analyzed the detection\nof gamma-ray signals arising from decaying gravitino DM considering experiments\nsuch as \Fermi-LAT. For this purpose all gravitino decays have been\ntaken into account, complementing previous works. The possibility of an\nupcoming new generation of gamma-ray detectors has motivated the inclusion of\naxino, the supersymmetric partner of the axion, as a DM candidate. In this\nthesis, axino DM has been analyzed in the context of the \μ\νSSM for the\nfirst time. Finally, scenarios with multicomponent DM have been studied,\nfocusing on gravitinos and axinos coexisting as DM constituents. This novel\nscenario includes two very different cases with distinctive features: axino\nlighter than gravitino and vice versa. Considering the sensitivity of future\nMeV-GeV gamma-ray telescopes, axino and gravitino prospects of detection were\nanalyzed in the mixed scenarios mentioned previously. In some parameter space\nregions, both candidates can produce a signal, therefore a double-line feature\narises as a smoking gun that would uncover the DM composition.\n