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Matrix and vectorial generalized Calogero-Moser models. (English) Zbl 1511.81147

Summary: Many-body one-dimensional systems with \(1/x^2\) interactions are known as Calogero-Moser systems. The so called ordinary system with a common coupling constant for all interacting pairs can be generalized into models with couplings which evolve as additional degrees of freedom. This can be done via unitary reduction of a linear matrix model or, alternatively, by assigning a vectorial degree of freedom to each particle. We briefly review the matrix and vector formulations in the context of Hamiltonian mechanics. Various models of this type were investigated separately in several previous studies. In this paper we focus on relations among them. In particular we prove that the seemingly two-particle variables governing the repulsion of each pair are in fact functions of one-particle variables. Identification of the ordinary Calogero-Moser system as an isolated stationary point in the space of generalized models is a starting point to classifying the generalized models according to the rank of the matrix of couplings or, equivalently, the effective number of independent non-spacial degrees of freedom. Finally, we present two new examples of generalized Calogero-Moser models. The first one combines the matrix and vector degrees of freedom and results in additional \(1/x\) interaction terms. The second one stems from a Hamilton function which mimics the Hamiltonian of a quantum model with spin exchange terms and leads to matrix anticommutator equations of motion.

MSC:

81V70 Many-body theory; quantum Hall effect
34L40 Particular ordinary differential operators (Dirac, one-dimensional Schrödinger, etc.)
81T32 Matrix models and tensor models for quantum field theory
15A21 Canonical forms, reductions, classification
70H05 Hamilton’s equations
35J10 Schrödinger operator, Schrödinger equation
81S05 Commutation relations and statistics as related to quantum mechanics (general)
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References:

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