Hartley, D. H. and Tucker, Robin (1991) Extremal immersions and the extended frame bundle. In: Geometry of low-dimensional manifolds. London Mathematical Society Lecture Note Series . Cambridge University Press, Cambridge, pp. 207-230. ISBN 9780521399784
Full text not available from this repository.Abstract
We present a computationally powerful formulation of variational problems that depend on the extrinsic and intrinsic geometry of immersions into a manifold. The approach is based on a lift of the action integral to a larger space and proceeds by systematically constraining the variations to preserve the foliation of a Pfaffian system on an extended frame bundle. Explicit Euler-Lagrange equations are computed for a very general class of Lagrangians and the method illustrated with examples relevant to recent developments in theoretical physics. The method provides a means of determining spatial boundary conditions for immersions with boundary and enables a construction to be made of constants of the motion in terms of Euler- Lagrange solutions and admissible symmetry vectors.