Project/Area Number  02640223 
Research Category 
GrantinAid for Scientific Research (C).

Research Field 
核・宇宙線・素粒子

Research Institution  Nagoya University 
Principal Investigator 
MATSUOKA Takeo Nagoya University, Faculty of Science, Associate Professor., 理学部, 助教授 (90022722)

CoInvestigator(Kenkyūbuntansha) 
MATSUDA Masahisa Aichi University of Education, Faculty of Education, Associate Professor., 教育学部, 助教授 (30111868)
SAWADA Shoji Nagoya University, Faculty of Science, Professor., 理学部, 教授 (50022546)

Project Fiscal Year 
1990 – 1991

Project Status 
Completed(Fiscal Year 1991)

Budget Amount *help 
¥1,200,000 (Direct Cost : ¥1,200,000)
Fiscal Year 1991 : ¥600,000 (Direct Cost : ¥600,000)
Fiscal Year 1990 : ¥600,000 (Direct Cost : ¥600,000)

Keywords  Superstring Theory / Conformal Invariance / Compactification / Supersymmetry / Yukawa Coupling / RParity Violation / Gauge Hierarchy / Generation Mixing / 超弦理論 / 共形不変性 / 高次元時空のコンパクト化 / 超対称性 / 湯川結合 / Rパリティの破れ / ゲジ階層 / 世代混合 / カラビヤウのコンパクト化 
Research Abstract 
Superstring theory is the most promising unified theory. In this theory the spacetime dimension should be more than four so that the theory becomes consistent at quantum level. Fourdimensional effective theory is derived after the compactification through which the extradimensional space becomes a conformal invariant comactified manifold dynamically. In this theory topological and geometrical structure of the manifold is closely related to various properties of the lowenergy effective theory such as gauge symmetries, matter fields and their couplings. Therefore, it is of critical importance to clarify the relation between the structure of compactified manifold and lowenergy effective theory. In this proposed spontaneous deformation of conformal invariant manifold and using this mechanism we investigated viable effective theory from calabiYau superstring. We studied characteristic features of the effective theory and expected new phennomena at the electroweak scale. 1. We found realistic solutions in which the proton stability is guaranteed and the unification of gauge couplings is realized. 2. We pointed out the possibility that Rparity is spontaneously broken at TeV scale. Chargino and neutralino mass spectra are calculated and the lightest masses among them are predicted to be less than weak boson masses. Furthemore, we discussed the generation number and the structure of flavor mixing. 3. In the twoHiggsdoublet model expected from the supersymmetric model, it is found that the charged Higgs contribution can give a sizable enhancement to the branching fractions of Bmeson charamless decay. 4. We studied the stability of quantum chiral solitions coupled with the vector mesons.
