| Project/Area Number |
10640016
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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 |
Algebra
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| Research Institution | Nagoya University |
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Principal Investigator |
NAKANISHI Tomoki Graduate School of Mathematics,Associate Professor, 大学院・多元数理科学研究科, 助教授 (80227842)
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| Co-Investigator(Kenkyū-buntansha) |
OKADA Soichi Graduate School of Mathematics,Associate Professor, 大学院・多元数理科学研究科, 助教授 (20224016)
TSUCHIYA Akihiro Graduate School of Mathematics,Professor, 大学院・多元数理科学研究科, 教授 (90022673)
AOMOTO Kazuhiko Graduate School of Mathematics,Professor, 大学院・多元数理科学研究科, 教授 (00011495)
HAYASHI Takahiro Graduate School of Mathematics,Associate Professor, 大学院・多元数理科学研究科, 助教授 (60208618)
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| Project Period (FY) |
1998 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2001: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2000: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1999: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1998: ¥900,000 (Direct Cost: ¥900,000)
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| Keywords | Bethe ansatz / Heisenberg model / quantum group / intergrable models / ベーテ方程式 / ベーテ仮説 / Bethe方程式 / 可積分格子模型 |
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| Research Abstract |
We obtain the following new results on the integrable structure of integrable lattice models.
1. The formal completeness theorem on the Bethe equation for the XXZ-type spin models. (Nakanishi, Kuniba, Tsuboi (Tokyo Univ.))
By classifying the string solutions of the Bethe equation for the XXZ-type spin models in the q=0 limit, we showed that, under the Kirillov-Reshetikhin (KR) conjecture on the KR modules of the quantum affine algebras, the power series formula of the character of the KR module representing the formal completeness of the XXZ-type spin models holds for any affine Lie algebra.
2. Reformulation of the Kirillov-Reshetikhin conjecture by the canonical solutions of the Q-systems. (Nakanishi, Kuniba, Tsuboi (Tokyo Univ.))
By observing the principle mechanism for various formulae and theorems obtained in the study of 1, we completely clarified the relation between these power series formulae representing the formal completeness and the underlying functional (algebraic) equations (Q-system of KR-type). Namely, we introduce a kind of functional equations (finite Q-system) for a finite number of functions of a finite number of variables. A finite Q-system has a remarkable property that its unique solution admits two power series formula by the Lagrange inversion formula for several variables. They are exactly a finite-variable analogue of the formal completeness formulae for the XXX-type and XXZ-type models. The formal completeness formula can be obtained as the projective limit of this formula.
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