Browsing Research and Publications - Department of Physics & Astronomy by Subject "Dark matter (stellar, interstellar, galactic, and cosmological)"

Browsing Research and Publications - Department of Physics & Astronomy by Subject "Dark matter (stellar, interstellar, galactic, and cosmological)"

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  • Okada, Nobuchika (2012-06-12)
    When the classically conformal invariance is imposed on the minimal gauged B−L extended standard model, the B−L gauge symmetry is broken by the Coleman-Weinberg mechanism naturally at the TeV scale. Introducing a new Z₂ ...
  • Okada, Nobuchika (2014-02-27)
    It has been recently pointed out that the excess of the gamma ray spectrum in the Fermi bubbles at low latitude can be well explained by the annihilation of dark matter particles. The best-fit candidate corresponds to the ...
  • Okada, Nobuchika (2009-05-27)
    In Gauss-Bonnet braneworld cosmology, the Friedmann equation of our four-dimensional Universe on 3-brane is modified in a high energy regime (Gauss-Bonnet regime), while the standard expansion law is reproduced in low ...
  • Okada, Nobuchika (2008-06-05)
    We investigate the so-called superWIMP scenario with the gravitino as the lightest supersymmetric particle (LSP) in the context of nonstandard cosmology, in particular, brane world cosmology. As a candidate of the next-to-LSP ...
  • Okada, Nobuchika (2010-07-14)
    We propose a scenario of the right-handed neutrino dark matter in the context of the minimal gauged U(1)⌄(B−L) model by introducing an additional parity which ensures the stability of dark matter particle. The annihilation ...
  • Okada, Nobuchika (2005-03-31)
    The thermal relic density of neutralino dark matter in the brane world cosmology is studied. Since the expansion law at a high energy regime in the brane world cosmology is modified from the one in the standard cosmology, ...
  • Okada, Nobuchika (2012-09-21)
    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 ...
  • Okada, Nobuchika (2009-10-09)
    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) ...
  • Santander, Marcos (2011-07-29)
    Self-annihilating or decaying dark matter in the Galactic halo might produce high energy neutrinos detectable with neutrino telescopes. We have conducted a search for such a signal using 276 days of data from the IceCube ...
  • Okada, Nobuchika (2012-03-16)
    We propose a supersymmetric extension of the minimal B−L model where we consider a new Z₂-parity under which one right-handed neutrino is assigned odd parity. When the Majorana Yukawa coupling of a Z₂-even right-handed ...

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