Nilpotent integrability, reduction of dynamical systems and a third-order Calogero-Moser system Articles uri icon

publication date

  • February 2019

start page

  • 1513

end page

  • 1540

issue

  • 5

volume

  • 198

International Standard Serial Number (ISSN)

  • 0373-3114

Electronic International Standard Serial Number (EISSN)

  • 1618-1891

abstract

  • We present an algebraic formulation of the notion of integrability of dynamical systems, based on a nilpotency property of its flow: It can be explicitly described as a polynomial on its evolution parameter. Such a property is established in a purely geometric&-algebraic language, in terms both of the algebra of all higher-order constants of the motion (named the nilpotent algebra of the dynamics) and of a maximal Abelian algebra of symmetries (called a Cartan subalgebra of the dynamics). It is shown that this notion of integrability amounts to the annihilator of the nilpotent algebra being contained in a Cartan subalgebra of the dynamics. Systems exhibiting this property will be said to be nilpotent-integrable. Our notion of nilpotent integrability offers a new insight into the intrinsic dynamical properties of a system, which is independent of any auxiliary geometric structure defined on its phase space. At the same time, it extends in a natural way the classical concept of integrability for Hamiltonian systems. An algebraic reduction procedure valid for nilpotent-integrable systems, generalizing the well-known reduction procedures for symplectic and/or Poisson systems on appropriate quotient spaces, is also discussed. In particular, it is shown that a large class of nilpotent-integrable systems can be obtained by reduction of higher-order free systems. The case of the third-order free system is analyzed and a non-trivial set of third-order Calogero&-Moser-like nilpotent-integrable equations is obtained.

keywords

  • dynamical systems; integrable systems; reduction methods; lie algebras