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The integrable quantum models, associated to the transfer matrices of the 6-vertex reflection algebra for spin 1/2 representations, are studied in this paper. In the framework of Sklyanin's quantum separation of variables (SOV), we provide…

Mathematical Physics · Physics 2025-09-30 G. Niccoli

We implement our new Separation of Variables (SoV) approach for open quantum integrable models associated to higher rank representations of the reflection algebras. We construct the (SoV) basis for the fundamental representations of the…

Mathematical Physics · Physics 2019-11-07 J. M. Maillet , G. Niccoli

The spin-1/2 highest weight representations of the dynamical 6-vertex and the standard 8-vertex Yang-Baxter algebra on a finite chain are considered in this paper. For the antiperiodic dynamical 6-vertex transfer matrix defined on chains…

Mathematical Physics · Physics 2013-02-26 G. Niccoli

This article is a direct continuation of [1] where we begun the study of the transfer matrix spectral problem for the cyclic representations of the trigonometric 6-vertex reflection algebra associated to the Bazhanov-Stroganov Lax operator.…

Mathematical Physics · Physics 2018-09-26 J. M. Maillet , G. Niccoli , B. Pezelier

In this paper we apply our new separation of variables approach to completely characterize the transfer matrix spectrum for quantum integrable lattice models associated to fundamental evaluation representations of $\mathcal{U}_{q}…

Mathematical Physics · Physics 2019-07-18 J. M. Maillet , G. Niccoli

We apply our new approach of quantum Separation of Variables (SoV) to the complete characterization of the transfer matrix spectrum of quantum integrable lattice models associated to gl(n)-invariant R-matrices in the fundamental…

Mathematical Physics · Physics 2019-06-19 J. M. Maillet , G. Niccoli

In this paper we consider the spin 1/2 highest weight representations for the 6-vertex Yang-Baxter algebra on a finite lattice and analyze the integrable quantum models associated to the antiperiodic transfer matrix. For these models, which…

Mathematical Physics · Physics 2013-02-26 G. Niccoli

The antiperiodic transfer matrix associated to higher spin representations of the rational 6-vertex Yang-Baxter algebra is analyzed by generalizing the approach introduced recently in [1], for the cyclic representations, in [2], for the…

Mathematical Physics · Physics 2013-06-04 G. Niccoli

We solve the longstanding problem to define a functional characterization of the spectrum of the transfer matrix associated to the most general spin-1/2 representations of the 6-vertex reflection algebra for general inhomogeneous chains.…

Mathematical Physics · Physics 2017-03-17 N. Kitanine , J. -M. Maillet , G. Niccoli

In [1] an integrable quantum model was introduced and a class of its cyclic representations was proven to define lattice regularizations of the Sine-Gordon model. Here, we analyze general cyclic representations of this integrable quantum…

Mathematical Physics · Physics 2011-03-31 G. Niccoli

We construct quantum Separation of Variables (SoV) bases for both the fundamental inhomogeneous $gl_{\mathcal{M}|\mathcal{N}}$ supersymmetric integrable models and for the inhomogeneous Hubbard model both defined with quasi-periodic twisted…

Mathematical Physics · Physics 2020-10-28 J. M. Maillet , G. Niccoli , L. Vignoli

In our previous paper [1] we have obtained, for the XXX spin-1/2 Heisenberg open chain, new determinant representations for the scalar products of separate states in the quantum separation of variables (SoV) framework. In this article we…

Mathematical Physics · Physics 2018-11-14 N. Kitanine , J. M. Maillet , G. Niccoli , V. Terras

We study the transfer matrix spectral problem for the cyclic representations of the trigonometric 6-vertex reflection algebra associated to the Bazhanov-Stroganov Lax operator. The results apply as well to the spectral analysis of the…

Mathematical Physics · Physics 2017-03-02 J. M. Maillet , G. Niccoli , B. Pezelier

We present a microscopic approach in the framework of Sklyanin's quantum separation of variables (SOV) for the exact solution of 1+1-dimensional quantum field theories by integrable lattice regularizations. Sklyanin's SOV is the natural…

Mathematical Physics · Physics 2013-01-28 G. Niccoli

We describe the extension, beyond fundamental representations of the Yang-Baxter algebra, of our new construction of separation of variables bases for quantum integrable lattice models. The key idea underlying our approach is to use the…

Mathematical Physics · Physics 2021-02-10 J. M. Maillet , G. Niccoli

We construct the Baxter Q-operator and the representation of the Separated Variables (SoV) for the homogeneous open SL(2,R) spin chain. Applying the diagrammatical approach, we calculate Sklyanin's integration measure in the separated…

High Energy Physics - Theory · Physics 2014-11-18 D. E. Derkachov , G. P. Korchemsky , A. N. Manashov

In [1], the spectrum (eigenvalues and eigenstates) of a lattice regularizations of the Sine-Gordon model has been completely characterized in terms of polynomial solutions with certain properties of the Baxter equation. This…

High Energy Physics - Theory · Physics 2010-05-12 G. Niccoli

Separation of variables (SoV) is a powerful method expected to be applicable for a wide range of quantum integrable systems, from models in condensed matter physics to gauge and string theories. Yet its full implementation for many higher…

High Energy Physics - Theory · Physics 2025-06-06 Fedor Levkovich-Maslyuk

Using the framework of the quantum separation of variables (SoV) for higher rank quantum integrable lattice models [1], we introduce some foundations to go beyond the obtained complete transfer matrix spectrum description, and open the way…

Mathematical Physics · Physics 2020-12-16 J. M. Maillet , G. Niccoli , L. Vignoli

The most general cyclic representations of the quantum integrable tau_2-model are analyzed. The complete characterization of the tau_2-spectrum (eigenvalues and eigenstates) is achieved in the framework of Sklyanin's Separation of Variables…

Mathematical Physics · Physics 2012-11-27 N. Grosjean , G. Niccoli
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