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Classical tau-function for quantum spin chains
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DOI：10.1007/JHEP09(2013)064.png)
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For an arbitrary generalized quantum integrable spin chain we introduce a master T-operator which represents a generating function for commuting quantum transfer matrices constructed by means of the fusion procedure in the auxiliary space. We show that the functional relations for the transfer matrices are equivalent to an infinite set of model-independent bilinear equations of the Hirota form for the master T-operator, which allows one to identify it with tau-function of an integrable hierarchy of classical soliton equations. In this paper we consider spin chains with rational GL(N)-invariant R-matrices but the result is independent of a particular functional form of the transfer matrices and directly applies to quantum integrable models with more general (trigonometric and elliptic) R-matrices and to supersymmetric spin chains.
Keyword:
Integrable Equations in Physics
Lattice Integrable Models
期刊
IF:
5.5
论文数:
3.9W
被引数:
13.7W
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