PAMELA and Fermi LAT Signals from Long-Lived Kaluza-Klein Dark Matter

Show simple item record Okada, Nobuchika 2019-05-20T17:58:08Z 2019-05-20T17:58:08Z 2009-10-09 en_US
dc.description.abstract We propose a simple extension of the minimal universal extra dimension model by introducing a small curvature. The model is formulated as a small anti–de Sitter curvature limit of the five-dimensional standard model (SM) in the Randall-Sundrum background geometry. While the lightest Kaluza-Klein (KK) particle can be thermal relic dark matter as usual in the universal extra dimension model, the KK parity is explicitly broken in the presence of the small curvature and the KK dark matter decays into the SM fermions with a long lifetime. Couplings of the KK dark matter with SM fermion pairs in the five-dimensional bulk are controlled by fermion bulk masses. By tuning bulk masses of quarks, we can suppress KK dark matter decay into quarks. With a suitable choice of bulk masses for leptons, KK dark matter decay into leptons can account for the cosmic-ray electron/positron excesses reported by the recent PAMELA and Fermi LAT satellite experiments. en_US
dc.format.mimetype application/pdf en_US
dc.language English 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.subject String and brane phenomenology en_US
dc.subject Dark matter (stellar, interstellar, galactic, and cosmological) en_US
dc.subject Cosmic rays (including sources, origin, acceleration, and interactions) en_US
dc.title PAMELA and Fermi LAT Signals from Long-Lived Kaluza-Klein Dark Matter en_US
dc.type text en_US

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