Harmonic 4-Spaces.
Harmonic maps on contact metric manifolds
Harnack inequalities for curvature flows depending on mean curvature.
Holonomy groups of complete flat manifolds
We present short direct proofs of two known properties of complete flat manifolds. They say that the diffeomorphism classes of m-dimensional complete flat manifolds form a finite set and that each element of is represented by a manifold with finite holonomy group.
Holonomy groups of five dimensional Bieberbach groups.
Homogeneous Einstein metrics on flag manifolds.
Homogeneous Einstein Metrics on Spheres and Proiective Spaces.
Homogeneous Einstein metrics on Stiefel manifolds
A Stiefel manifold is the set of orthonormal -frames in , and it is diffeomorphic to the homogeneous space . We study -invariant Einstein metrics on this space. We determine when the standard metric on is Einstein, and we give an explicit solution to the Einstein equation for the space .
Hyperkähler manifolds