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On Solutions of the Bethe Ansatz for the Quantum KdV Model
- Source :
- Communications in Mathematical Physics.
- Publication Year :
- 2023
- Publisher :
- Springer Science and Business Media LLC, 2023.
-
Abstract
- We study the Bethe Ansatz Equations for the Quantum KdV model, which are also known to be solved by the spectral determinants of a specific family of anharmonic oscillators called monster potentials (ODE/IM correspondence). These Bethe Ansatz Equations depend on two parameters, identified with the momentum and the degree at infinity of the anharmonic oscillators. We provide a complete classification of the solutions with only real and positive roots -- when the degree is greater than 2 -- in terms of admissible sequences of holes. In particular, we prove that admissible sequences of holes are naturally parameterised by integer partitions, and we prove that they are in one-to-one correspondence with solutions of the Bethe Ansatz Equations if the momentum is large enough. Consequently, we deduce that the monster potentials are complete, in the sense that every solution of the Bethe Ansatz Equations coincides with the spectrum of a unique monster potential. This essentially (i.e. up to gaps in the previous literature) proves the ODE/IM correspondence for the Quantum KdV model/monster potentials -- which was conjectured by Dorey-Tateo and Bazhanov-Lukyanov-Zamolodchikov -- when the degree is greater than 2. Our approach is based on the transformation of the Bethe Ansatz Equations into a free-boundary nonlinear integral equation -- akin to the equations known in the physics literature as DDV or KBP or NLIE -- of which we develop the mathematical theory from the beginning.<br />Comment: 49 pages, 3 figures. Minor revision. Accepted version. To appear on Communications in Mathematical Physics (2023)
- Subjects :
- High Energy Physics - Theory
Nonlinear Sciences::Exactly Solvable and Integrable Systems
High Energy Physics - Theory (hep-th)
Mathematics - Classical Analysis and ODEs
Classical Analysis and ODEs (math.CA)
FOS: Mathematics
FOS: Physical sciences
Statistical and Nonlinear Physics
Mathematical Physics (math-ph)
Mathematical Physics
Subjects
Details
- ISSN :
- 14320916 and 00103616
- Database :
- OpenAIRE
- Journal :
- Communications in Mathematical Physics
- Accession number :
- edsair.doi.dedup.....a63403be2f44ca5a207fa641d56fad3b