Originally Asymmetric Dark Matter

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dc.contributor.author Okada, Nobuchika
dc.date.accessioned 2019-05-16T19:50:44Z
dc.date.available 2019-05-16T19:50:44Z
dc.date.issued 2012-09-21 en_US
dc.identifier.uri http://ir.ua.edu/handle/123456789/5567
dc.description.abstract We propose a scenario with a fermion dark matter, where the dark matter particle used to be the Dirac fermion, but it takes the form of the Majorana fermion at a late time. The relic number density of the dark matter is determined by the dark matter asymmetry generated through the same mechanism as leptogenesis when the dark matter was the Dirac fermion. After efficient dark matter annihilation processes have frozen-out, a phase transition of a scalar field takes place and generates Majorana mass terms to turn the dark matter particle into the Majorana fermion. In order to address this scenario in detail, we propose two simple models. The first one is based on the Standard Model (SM) gauge group and the dark matter originates the SU(2)⌄L doublet Dirac fermion, analogous to the Higgsino-like neutralino in supersymmetric models. We estimate the spin-independent/dependent elastic scattering cross sections of this late-time Majorana dark matter with a proton and find the possibility to discover it by the direct and/or indirect dark matter search experiments in the near future. The second model is based on the B−L gauged extension of the SM, where the dark matter is a SM singlet. Although this model is similar to the so-called Higgs portal dark matter scenario, the spin-independent elastic scattering cross section can be large enough to detect this dark matter in future experiments. en_US
dc.format.mimetype application/pdf en_US
dc.language English en_US
dc.subject Dark matter (stellar, interstellar, galactic, and cosmological) en_US
dc.subject Finite-temperature field theory en_US
dc.subject Global symmetries (e.g., baryon number, lepton number) en_US
dc.subject Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.) en_US
dc.title Originally Asymmetric Dark Matter en_US
dc.type text en_US

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