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Journal of Applied Mathematics

Quantum relativistic Toda chain

G. P. Pronko, С. М. Сергеев

Published Jan 1, 2001• 9 citations
Publisher

Abstract

Investigated is the quantum relativistic periodic Toda chain, to each site of which the ultra‐local Weyl algebra is associated. Weyl’s q we are considering here is restricted to be inside the unit circle. Quantum Lax operators of the model are intertwined by six‐vertex R‐matrix. Both independent Baxter’s Q‐operators are constructed explicitly as seria over local Weyl generators. The operator‐valued Wronskian of R‐matrix. Both independent Baxter’s Qs is also calculated.

DOI
10.1155/s1110757x01000055

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Investigated is the quantum relativistic periodic Toda chain, to each site of which the ultra‐local Weyl algebra is associated. Weyl’s q we are considering here is restricted to be inside the unit circle. Quantum Lax operators of the model are intertwined by six‐vertex R‐matrix. Both independent Baxter’s Q‐operators are constructed explicitly as seria over local Weyl generators. The operator‐valued Wronskian of R‐matrix. Both independent Baxter’s Qs is also calculated.
Investigated is the relativistic periodic Toda chain, to each site of which the ultra-local Weyl algebra is associated. Weyl's qqq we are considering here is restricted to be inside the unit circle. Quantum Lax operators of the model are intertwined by six vertex RRR-matrix. Both independent Baxter's QQQ-operators are constructed explicitly as seria over local Weyl generators. The operator-valued wronskian of QQQ-s is also calculated.
We investigate an N‐state spin model called quantum relativistic Toda chain and based on the unitary finite‐dimensional representations of the Weyl algebra with q being Nth primitive root of unity. Parameters of the finite‐dimensional representation of the local Weyl algebra form the classical discrete integrable system. Nontrivial dynamics of the classical counterpart corresponds to isospectral transformations of the spin system. Similarity operators are constructed with the help of modified Baxter′s Q‐operators. The classical counterpart of the modified Q‐operator for the initial homogeneous spin chain is a Bäcklund transformation. This transformation creates an extra Hirota‐type soliton in a parameterization of the chain structure. Special choice of values of solitonic amplitudes yields a degeneration of spin eigenstates, leading to the quantum separation of variables, or the functional Bethe ansatz. A projector to the separated eigenstates is constructed explicitly as a product of modified Q‐operators.
We construct the Baxter operator [Formula: see text] for the [Formula: see text]-Toda chain and the Toda2 chain (the Toda chain in the second Hamiltonian structure). Our construction builds on the relation between the Baxter operator and Bäcklund transformations that were unravelled in [13]. We construct a number of quantum intertwiners ensuring the commutativity of [Formula: see text] with the transfer matrix of the models and of the [Formula: see text]’s between each other. Most importantly, [Formula: see text] is modular invariant in the sense of Faddeev. We derive the Baxter equation for the eigenvalues [Formula: see text] of [Formula: see text] and show that these are entire functions of [Formula: see text]. This last property will ultimately lead to the quantization of the spectrum for the considered Toda chains, in a subsequent publication [1]. This work is dedicated to the memory of L. D. Faddeev
A new integrable class of quantum models representing a family of different discrete-time or relativistic generalisations of the periodic Toda chain (TC), including that of a recently proposed classical close to TC model [7] is presented. All such models are shown to be obtainable from a single ancestor model at different realisations of the underlying quantised algebra. As a consequence the (2times2)(2\\times 2)(2times2) Lax operators and the associated quantum RRR-matrices for these models are easily derived ensuring their quantum integrability. It is shown that the functional Bethe ansatz developed for the quntum TC is trivially generalised to achieve seperation of variables also for the present models.
We develop the Baxterization approach to (an extension of) the quantum group GL q (2). We introduce two matrices which play the role of spectral parameter-dependent L -matrices and observe that they are naturally related to two different comultiplications. Using these comultiplication structures, we find the related fundamental R-operators in terms of powers of coproducts and also give their equivalent forms in terms of quantum dilogarithms. The corresponding quantum local Hamiltonians are given in terms of logarithms of positive operators. An analogous construction is developed for the q -oscillator and Weyl algebras using the fact that their algebraic and coalgebraic structures can be obtained as reductions of those for the quantum group. As an application, the lattice Liouville model, the q -DST model, the Volterra model, a lattice regularization of the free field and the relativistic Toda model are considered.