The geometry of systems of third order differential equations induced by second order Lagrangians

Details The geometry of systems of third order differential equations induced by second order Lagrangians The geometry of systems of third order differential equations induced by second order Lagrangians

2007-05-25

arxiv.org/abs/0705.3689v2

Mediterranean Journal of Mathematics, vol 6, no.4 (2009), 487-504

Mathematics

Differential Geometry

Scientific paper

10.1007/s00009-009-0020-9

A dynamical system on the total space of the fibre bundle of second order accelerations, $T^2M$, is defined as a third order vector field $S$ on $T^2M$, called semispray, which is mapped by the second order tangent structure into one of the Liouville vector field. For a regular Lagrangian of second order we prove that this semispray is uniquely determined by two associated Cartan-Poincar\'e one-forms. To study the geometry of this semispray we construct a nonlinear connection, which is a Lagrangian subbundle for the presymplectic structure. Using this semispray and the associated nonlinear connection we define covariant derivatives of first and second order. With respect to this, the second order dynamical derivative of the Lagrangian metric tensor vanishes.

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