dorsal/arxiv
View SchemaColoured quantum universal enveloping algebras
| Authors | C. Quesne |
|---|---|
| Categories | |
| ArXiv ID | q-alg/9706002 |
| URL | https://arxiv.org/abs/q-alg/9706002 |
| DOI | 10.1063/1.532178 |
| Journal | J. Math. Phys. 38 (1997) 6018-6039 |
Abstract
We define some new algebraic structures, termed coloured Hopf algebras, by combining the coalgebra structures and antipodes of a standard Hopf algebra set $\cal H$, corresponding to some parameter set $\cal Q$, with the transformations of an algebra isomorphism group $\cal G$, herein called colour group. Such transformations are labelled by some colour parameters, taking values in a colour set $\cal C$. We show that various classes of Hopf algebras, such as almost cocommutative, coboundary, quasitriangular, and triangular ones, can be extended into corresponding coloured algebraic structures, and that coloured quasitriangular Hopf algebras, in particular, are characterized by the existence of a coloured universal $\cal R$-matrix, satisfying the coloured Yang-Baxter equation. The present definitions extend those previously introduced by Ohtsuki, which correspond to some substructures in those cases where the colour group is abelian. We apply the new concepts to construct coloured quantum universal enveloping algebras of both semisimple and nonsemisimple Lie algebras, considering several examples with fixed or varying parameters. As a by-product, some of the matrix representations of coloured universal $\cal R$-matrices, derived in the present paper, provide new solutions of the coloured Yang-Baxter equation, which might be of interest in the context of integrable models.
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"abstract": "We define some new algebraic structures, termed coloured Hopf algebras, by\ncombining the coalgebra structures and antipodes of a standard Hopf algebra set\n$\\cal H$, corresponding to some parameter set $\\cal Q$, with the\ntransformations of an algebra isomorphism group $\\cal G$, herein called colour\ngroup. Such transformations are labelled by some colour parameters, taking\nvalues in a colour set $\\cal C$. We show that various classes of Hopf algebras,\nsuch as almost cocommutative, coboundary, quasitriangular, and triangular ones,\ncan be extended into corresponding coloured algebraic structures, and that\ncoloured quasitriangular Hopf algebras, in particular, are characterized by the\nexistence of a coloured universal $\\cal R$-matrix, satisfying the coloured\nYang-Baxter equation. The present definitions extend those previously\nintroduced by Ohtsuki, which correspond to some substructures in those cases\nwhere the colour group is abelian. We apply the new concepts to construct\ncoloured quantum universal enveloping algebras of both semisimple and\nnonsemisimple Lie algebras, considering several examples with fixed or varying\nparameters. As a by-product, some of the matrix representations of coloured\nuniversal $\\cal R$-matrices, derived in the present paper, provide new\nsolutions of the coloured Yang-Baxter equation, which might be of interest in\nthe context of integrable models.",
"arxiv_id": "q-alg/9706002",
"authors": [
"C. Quesne"
],
"categories": [
"q-alg",
"hep-th",
"math.QA"
],
"doi": "10.1063/1.532178",
"journal_ref": "J. Math. Phys. 38 (1997) 6018-6039",
"title": "Coloured quantum universal enveloping algebras",
"url": "https://arxiv.org/abs/q-alg/9706002"
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