| Project/Area Number |
12640201
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Global analysis
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| Research Institution | IBARAKI UNIVERSITY |
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Principal Investigator |
YAMAGAMI Shigeru Ibaraki Univ., college of Science, Professor, 理学部, 教授 (90175654)
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| Co-Investigator(Kenkyū-buntansha) |
OHTSUKA Fumiko Ibaraki Univ., college of Science, Associate Prof., 理学部, 助教授 (90194208)
FUJIWARA Takanori Ibaraki Univ., college of Science, Professor, 理学部, 教授 (50183596)
HIAI Fumio Tohoku Univ., Information Science, Professor, 情報科学研究科, 教授 (30092571)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 2002: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2001: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2000: ¥900,000 (Direct Cost: ¥900,000)
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| Keywords | tensor categories / orbifold / Hopf algebras / Frobenius algebra / bimodule / duality / 五角形方程式 / 自由積 / スペクトル流 / 平面代数 / 分岐則代数 |
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| Research Abstract |
1. A polygonal presentation is formulated for semisimple tensor categories. The result is then used to describe duality structures on semisimple tensor categories.
2. Symmetries of tensor categories are formulated for finite groups, which is applied to perform orbifold constructions in tensor categories. For the case of abelian groups, we further formulate the second orbifolds and have established the duality for orbifolds, which contains the famous AD-duality as a special case.
3. As a variation of rigidity in tensor categories, we have formulated the notion of Frobenius reciprocity and derived various formulas on cyclic tensor products. As an application, the combinatorial structure in subfactor theory is proved to be equivalent to the reciprocity.
4. The orbifold construction for tensor categories is extended to the symmetry governed by the representation of finite-dimensional Hopf algebras so that the duality remains valid.
5. The duality principle for orbifolds is further extended in terms of the notion of splitting Frobenius algebras in tensor categories. The orbifold construction is here interpreted as taking bimodule extensions with actions of relevant categorical Frobenius algebras.
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