Abstract
The energy of Riemannian almost-product structure P is measured by forming the Dirichlet integral of the associated Gauss section γ, and P is decreed harmonic if γ criticalizes the energy functional when restricted to the submanifold of sections of the Grassman bundle. Euler-Lagrange equations are obtained, and geometrically transformed in the special case when P is totally geodesic. These are seen to generalize the Yang-Mills equations, and generalizations of the self-duality and anti-self-duality conditions are suggested. Several applications are then described. In particular, it is considered whether integrability of P is a necessary condition for γ to be harmonic.
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