Cosmological Constraints for the Cold Dark Matter and Model Building Based on the Flavor Symmetric Radiative Seesaw Model(VIII Asia-Pacific International Conference on Gravitation and Astrophysics (ICGA8))

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概要

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• It is now clear that the masses of the neutrino sector are much lighter than those of the other three sectors. There are many attempts to explain the neutrino masses radiatively by means of inert Higgses, which do not have vacuum expectation values. Then one can discuss cold dark matter candidates, because of no needing so heavy particles and having a Z_2 parity symmetry corresponding to the R-parity symmetry of the MSSM. The most famous work would be the Zee model. [A. Zee, Phys. Lett. B 93 (1980), 389 [Errata ; 95 (1980), 461] ; Nucl. Phys. B 264 (1986), 99. K. S. Babu, Phys. Lett. B 203 (1988), 132. E. Ma, Phys. Rev. Lett. 81 (1998), 1171] Recently a new type model [E. Ma, Phys. Rev. D 73 (2006), 077301] along this line of thought was proposed by Mr. E. Ma. We paid attention to this idea. We introduce a flavor symmetry based on a dihedral group D_6 to constrain the Yukawa sector. For the neutrino sector, we find that the maximal mixing of atmospheric neutrinos is realized, it can also be shown that only an inverted mass spectrum, the value of |V_<MNS_13>| is 0.0034 and so on. When one extends the Higgs sector, it leads to FCNCs mediated by Higgs fields generally. But in our model, the FCNCs are (of course) suppressed for the experiments sufficiently. [A. Mondragon, M. Mondragon and E. Peinado, arXiv : 0712.1799] For the fermionic CDM candidates, we find that the mass of the CDM and the inert Higgs should be larger than about 230 and 300 GeV, respectively. If we restrict ourselves to a perturbative regime, they should be lighter than about 750 GeV. [Y. Kajiyama, J. Kubo and H. Okada, Phys. Rev. D 75 (2007), 033001]

• 2008-07-09

著者

• Okada Hiroshi

  Institute for Theoretical Physics, Kanazawa University

• Okada Hiroshi

  British Univ. Egypt El Sherouk City Egy

• Okada Hiroshi

  Institute For Theoretical Physics Kanazawa University

関連論文

• Cosmological Constraints for the Cold Dark Matter and Model Building Based on the Flavor Symmetric Radiative Seesaw Model(VIII Asia-Pacific International Conference on Gravitation and Astrophysics (ICGA8))
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