Topic
Integrable system
About: Integrable system is a research topic. Over the lifetime, 13193 publications have been published within this topic receiving 282677 citations. The topic is also known as: Frobenius integrability & Liouville integrability.
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26 May 1996
TL;DR: In this paper, the authors used algebraic Bethe Ansatz for solving integrable models and showed how it works in detail on the simplest example of spin 1/2 XXX magnetic chain.
Abstract: I study the technique of Algebraic Bethe Ansatz for solving integrable models and show how it works in detail on the simplest example of spin 1/2 XXX magnetic chain. Several other models are treated more superficially, only the specific details are given. Several parameters, appearing in these generalizations: spin $s$, anisotropy parameter $\ga$, shift $\om$ in the alternating chain, allow to include in our treatment most known examples of soliton theory, including relativistic model of Quantum Field Theory.
814 citations
TL;DR: In this article, the authors consider fully many-body-localized systems, i.e., isolated quantum systems where all the manybody eigenstates of the Hamiltonian are localized, and define a sense in which such systems are integrable with localized conserved operators.
Abstract: We consider fully many-body-localized systems, i.e., isolated quantum systems where all the many-body eigenstates of the Hamiltonian are localized. We define a sense in which such systems are integrable, with localized conserved operators. These localized operators are interacting pseudospins, and the Hamiltonian is such that unitary time evolution produces dephasing but not ``flips'' of these pseudospins. As a result, an initial quantum state of a pseudospin can in principle be recovered via (pseudospin) echo procedures. We discuss how the exponentially decaying interactions between pseudospins lead to logarithmic-in-time spreading of entanglement starting from nonentangled initial states. These systems exhibit multiple different length scales that can be defined from exponential functions of distance; we suggest that some of these decay lengths diverge at the phase transition out of the fully many-body-localized phase while others remain finite.
810 citations
TL;DR: A simple scaling argument shows that most integrable evolutionary systems, which are known to admit a bi-Hamiltonian structure, are, in fact, governed by a compatible trio of Hamiltonian structures, and it is demonstrated how their recombination leads toIntegrable hierarchies endowed with nonlinear dispersion that supports compactons, or cusped and/or peaked solitons.
Abstract: A simple scaling argument shows that most integrable evolutionary systems, which are known to admit a bi-Hamiltonian structure, are, in fact, governed by a compatible trio of Hamiltonian structures. We demonstrate how their recombination leads to integrable hierarchies endowed with nonlinear dispersion that supports compactons (solitary-wave solutions having compact support), or cusped and/or peaked solitons. A general algorithm for effecting this duality between classical solitons and their nonsmooth counterparts is illustrated by the construction of dual versions of the modified Korteweg--de Vries equation, the nonlinear Schr\"odinger equation, the integrable Boussinesq system used to model the two-way propagation of shallow water waves, and the Ito system of coupled nonlinear wave equations. These hierarchies include a remarkable variety of interesting integrable nonlinear differential equations. \textcopyright{} 1996 The American Physical Society.
730 citations
Book•
01 Jan 1994
TL;DR: In this paper, the authors introduce Riemann surfaces and theta functions as mathematical methods used to analyzse solitons, dynamical systems, phase transitions, etc, and to obtain the solutions of the related non-linear integrable equations.
Abstract: A brief but self-contained exposition of the basics of Riemann surfaces and theta functions prepares the reader for the main subject of this text, namely the application of these theories to solving non-linear integrable equations for various physical systems. Physicists and engineers involved in studying solitons, phase transitions or dynamical (gyroscopic) systems, and mathematicians with some background in algebraic geometry and Abelian and automorphic functions, are the targeted audience. This book is suitable for use as a supplementary text to a course in mathematical physics. The authors introduce Riemann surfaces and theta functions as mathematical methods used to analyzse solitons, dynamical systems, phase transitions, etc, and to obtain the solutions of the related non-linear integrable equations.
711 citations
TL;DR: In this article, a unified approach to the long wavelength Bethe equations, the classical ferromagnet and the classical string solutions in the SU(2) sector is presented, governed by complex curves endowed with meromorphic differentials with integer periods.
Abstract: We discuss the AdS/CFT duality from the perspective of integrable systems and establish a direct relationship between the dimension of single trace local operators composed of two types of scalar fields in = 4 super Yang-Mills and the energy of their dual semiclassical string states in AdS5 × S5. The anomalous dimensions can be computed using a set of Bethe equations, which for ``long'' operators reduces to a Riemann-Hilbert problem. We develop a unified approach to the long wavelength Bethe equations, the classical ferromagnet and the classical string solutions in the SU(2) sector and present a general solution, governed by complex curves endowed with meromorphic differentials with integer periods. Using this solution we compute the anomalous dimensions of these long operators up to two loops and demonstrate that they agree with string-theory predictions.
707 citations