2012/03/31 by W. Buchmüller, Wilfried Buchmüller, Valerie Domcke +1 · 2 citations
Physics and Astronomy · #Baryon asymmetry #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Electron #Gravitino #Leptogenesis #Lepton #Lightest Supersymmetric Particle #Neutralino #Neutrino #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Supergravity #Supersymmetry #astro-ph.CO #hep-ex #hep-ph
paper · pdf · doi:10.1016/j.physletb.2012.05.042
published as Phys.Lett. B713 (2012) 63-67 · 13 pages, 5 figures. v3: version published in Phys.Lett.B
openalex publication_date 2012/05/23 · arxiv created 2012/07/18 · arxiv updated 2012/07/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The spontaneous breaking of B-L symmetry naturally accounts for the small observed neutrino masses via the seesaw mechanism. We have recently shown that the cosmological realization of B-L breaking in a supersymmetric theory can successfully generate the initial conditions of the hot early universe, i.e. entropy, baryon asymmetry and dark matter, if the gravitino is the lightest superparticle (LSP). This implies relations between neutrino and superparticle masses. Here we extend our analysis to the case of very heavy gravitinos which are motivated by hints for the Higgs boson at the LHC. We find that the nonthermal production of 'pure' wino or higgsino LSPs, i.e. weakly interacting massive particles (WIMPs), in heavy gravitino decays can account for the observed amount of dark matter while simultaneously fulfilling the constraints imposed by primordial nucleosynthesis and leptogenesis within a range of LSP, gravitino and neutrino masses. For instance, a mass of the lightest neutrino of 0.05 eV would require a higgsino mass below 900 GeV and a gravitino mass of at least 10 TeV.