On a Recently Introduced Fifth-Order Bi-Hamiltonian Equation and Trivially Related Hamiltonian Operators

Symmetry Integrability and Geometry-Methods and Applications

article

Daryoush Talati¹  Refik Turhan¹ 

[1] Department of Engineering Physics, Ankara University 06100 Tandogan Ankara

关键词: bi-Hamiltonian structure;    Hamiltonian operators;   

DOI  :  10.3842/SIGMA.2011.081

来源: National Academy of Science of Ukraine

【 摘 要 】

We show that a recently introduced fifth-order bi-Hamiltonian equation with a differentially constrained arbitrary function by A. de Sole, V.G. Kac and M. Wakimoto is not a new one but a higher symmetry of a third-order equation. We give an exhaustive list of cases of the arbitrary function in this equation, in each of which the associated equation is inequivalent to the equations in the remaining cases. The equations in each of the cases are linked to equations known in the literature by invertible transformations. It is shown that the new Hamiltonian operator of order seven, using which the introduced equation is obtained, is trivially related to a known pair of fifth-order and third-order compatible Hamiltonian operators. Using the so-called trivial compositions of lower-order Hamiltonian operators, we give nonlocal generalizations of some higher-order Hamiltonian operators.

【 授权许可】

Unknown