Harmonic maps from Finsler manifolds

A Finsler manifold is a Riemannian manifold without the quadratic restriction. In this paper we introduce the energy functional, the Euler-Lagrange operator, and the stress-energy tensor for a smooth map phi from a Finsler manifold to a Riemannian manifold. We show that phi is an extremal of the energy functional if and only if phi satisfies the corresponding Euler-Lagrange equation. We also characterize weak Landsberg manifolds in terms of harmonicity and horizontal conservativity. Using the representation of a tension field in terms of geodesic coefficients, we construct new examples of harmonic snaps from Berwald manifolds which are neither Riemannian nor Minkowskian.