In recent years, the geometry of Hermitian manifolds has regenerated
interests, with the intent of pushing analysis on Kaehler manifolds to
general Hermitian ones, and also with the study of non-Kaehler Calabi-Yau
manifolds from string theory.
For a given Hermitian metric on a complex manifold, there are two canonical
connections associated with the metric, namely, the Hermitian (aka Chern)
connection r and the Riemannian (aka Levi-Civita) connection. The former is
the unique connection that is compatible with both the metric and the
complex structure, while the latter is the unique torsion-free connection
that is compatible with the metric. These two connection coincide precisely
when the metric is Kaehler.
In this talk, we will explore properties and behaviors of the curvature
tensors of the Hermitian and the Riemannian connection of a Hermitian
manifold, and examine some conditions on the curvature that will lead to
the Kaehlerness of the metric.