79 research outputs found
Functional relations and the Yang-Baxter algebra
Functional equations methods are a fundamental part of the theory of Exactly
Solvable Models in Statistical Mechanics and they are intimately connected with
Baxter's concept of commuting transfer matrices. This concept has culminated in
the celebrated Yang-Baxter equation which plays a fundamental role for the
construction of quantum integrable systems and also for obtaining their exact
solution. Here I shall discuss a proposal that has been put forward in the past
years, in which the Yang-Baxter algebra is viewed as a source of functional
equations describing quantities of physical interest. For instance, this method
has been successfully applied for the description of the spectrum of open spin
chains, partition functions of elliptic models with domain wall boundaries and
scalar product of Bethe vectors. Further applications of this method are also
discussed.Comment: 23 pages. Contribution to the proceedings of the ISQS2
Six-vertex model and non-linear differential equations I. Spectral problem
In this work we relate the spectral problem of the toroidal six-vertex
model's transfer matrix with the theory of integrable non-linear differential
equations. More precisely, we establish an analogy between the Classical
Inverse Scattering Method and previously proposed functional equations
originating from the Yang-Baxter algebra. The latter equations are then
regarded as an Auxiliary Linear Problem allowing us to show that the six-vertex
model's spectrum solves Riccati-type non-linear differential equations.
Generating functions of conserved quantities are expressed in terms of
determinants and we also discuss a relation between our Riccati equations and a
stationary Schr\"odinger equation.Comment: 42 pages, 3 figure
Off-shell scalar products for the spin chain with open boundaries
In this work we study scalar products of Bethe vectors associated with the
spin chain with open boundary conditions. The scalar products are
obtained as solutions of a system of functional equations. The description of
scalar products through functional relations follows from a particular map
having the reflection algebra as its domain and a function space as the
codomain. Within this approach we find a multiple contour integral
representation for the scalar products in which the homogeneous limit can be
obtained trivially.Comment: 33 pages. v2: figure and references added, presentation slightly
modifie
Twisted Heisenberg chain and the six-vertex model with DWBC
In this work we establish a relation between the six-vertex model with Domain
Wall Boundary Conditions (DWBC) and the spin chain with anti-periodic
twisted boundaries. More precisely, we demonstrate a formal relation between
the zeroes of the partition function of the six-vertex model with DWBC and the
zeroes of the transfer matrix eigenvalues associated with the six-vertex model
with a particular non-diagonal boundary twist.Comment: 17 pages. v2: 20 pages, presentation modified, details of derivations
added, references added. v3: typos fixed, minor changes, accepted for
publication in JSTA
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