Spontaneous Deformation of Maximally Symmetric Calabi-Yau Manifolds and a Realistic Four-Generation Model (素粒子論における現象論の展開(研究会報告))

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The spontaneous deformation of maximally symmetric Calabi-Yau manifold plays an essential role in constructing realistic superstring models. This mechanism is caused by the introduction of the soft supersymmetry breaking. A realistic four-generation superstring model has been presented explicitly by studying the dependence of the superpotential, containing the world-sheet instanton contribution of Kahler class moduli superfields R, on the complex structure moduli superfields C. In the present model we obtain the following results : a) one Higgs family h and h' in 27 remains massless and other five families in 27 and 27 get masses at the intermediate energy scale M_I of order 10^<15-16>GeV and b) the masses of all four families of g and g leptoquark superfields are given by the order of M_I. Especially the latter fact guarantees the stability of protons It is found that the gauge unification is realized as a consequence of the large intermediate energy scale and the peculiar mass spectra of the present model. In conclusion the present four-generation superstring model is phenomenologically viable.
素粒子論グループ素粒子研究編集部の論文
1990-08-20