abstract: In these talks, I will introduce the notion of a hamiltonian 2-form on a Kaehler manifold (or orbifold) and show how it leads to a special case of toric geometry, which we call orthotoric. I will prove that a compact orthotoric Kaehler manifold is a complex projective space, but I will extend our analysis to orthotoric orbifolds where the geometry is much richer. I will thus present new examples of Kaehler-Einstein 4-orbifolds.
This is a joint work with David Calderbank, Paul Gauduchon and Christina Tonnesen-Friedman, and appears in Section 3 of Hamiltonian 2-form in Kaehler Geometry II.