A class of Poisson-Nijenhuis structures on a tangent bundle

Details A class of Poisson-Nijenhuis structures on a tangent bundle A class of Poisson-Nijenhuis structures on a tangent bundle

2004-02-05

arxiv.org/abs/math/0402076v1

Mathematics

Differential Geometry

22 pages

Scientific paper

10.1088/0305-4470/37/24/010

Equipping the tangent bundle TQ of a manifold with a symplectic form coming from a regular Lagrangian L, we explore how to obtain a Poisson-Nijenhuis structure from a given type (1,1) tensor field J on Q. It is argued that the complete lift of J is not the natural candidate for a Nijenhuis tensor on TQ, but plays a crucial role in the construction of a different tensor R, which appears to be the pullback under the Legendre transform of the lift of J to co-tangent manifold of Q. We show how this tangent bundle view brings new insights and is capable also of producing all important results which are known from previous studies on the cotangent bundle, in the case that Q is equipped with a Riemannian metric. The present approach further paves the way for future generalizations.

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