## Grand unified theories: current status and future prospects : an international workshop, Kusatsu, Shiga, Japan, 17-19 December 2007 : GUT07We are confronting unprecedented situations that astrophysical observation meets with high energy physics. The discoveries of dark matter and dark energy as well as neutrino masses indicate the theory beyond the Standard Model, which could be the Grand Unified Theory (GUT). In this proceeding, the GUT is intensively discussed from the various points of views. |

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### Contents

Renormalizable Minimal SO10 GUT in 4D and 5D | 3 |

Proton Stability in Grand Unified Theories and Discrete Gauge Symmetries | 22 |

Unparticle Dark Matter | 36 |

Copyright | |

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### Common terms and phrases

baryon branching ratio brane charged lepton chiral compactification constraints dark matter denote dimensional diquark discrete symmetry electroweak family symmetry FCNC fermion masses flavor symmetry Fukuyama gauge bosons gauge coupling unification gauge group gauge symmetry gauge-Higgs unification gaugino Grand Unified Theories gravitino GUT models GUT scale hierarchy Higgs boson Higgs boson mass Higgs doublets Higgs fields Higgs mass inflaton interactions JHEP lattice lepton lepton flavor violation lepton masses Lett low energy Majorana mass matrix mass spectrum mass term masses and mixings massless minimal mixing angles MSSM multiplets neutrino mass neutrino oscillation Nucl nucleon obtain orbifold parameters particles Phys physics predictions problem proton decay quark mass quarks and leptons R. N. Mohapatra representations right-handed neutrinos saxion scenario singlet standard model supergravity superpotential supersymmetric suppressed SUSY breaking SUSY GUT symmetry breaking top quark triplet University unparticle WMAP Yukawa couplings Z2 parities zero mode