Kähler form

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The fundamental form of a Kähler metric on a complex manifold. A Kähler form is a harmonic real differential form of type $ ( 1, 1) $. A differential form $ \omega $ on a complex manifold $ M $ is the Kähler form of a Kähler metric if and only if every point $ x \in M $ has a neighbourhood $ U $ in which

$$ \omega = \ i \partial \overline \partial \; p = i \sum \frac{\partial ^ {2} p }{\partial z _ \alpha \partial \overline{z}\; _ \beta } dz _ \alpha \wedge d \overline{z}\; _ \beta , $$

where $ p $ is a strictly plurisubharmonic function in $ U $ and $ z _ {1} \dots z _ {n} $ are complex local coordinates.

A Kähler form is called a Hodge form if it corresponds to a Hodge metric, i.e. if it has integral periods or, equivalently, defines an integral cohomology class.


[1] R.O. Wells jr., "Differential analysis on complex manifolds" , Springer (1980)


For fundamental form of a Kähler metric see Kähler metric.


[a1] A. Weil, "Introduction à l'Aeetude des variétés kahlériennes" , Hermann (1958)
How to Cite This Entry:
Kähler form. Encyclopedia of Mathematics. URL:
This article was adapted from an original article by A.L. Onishchik (originator), which appeared in Encyclopedia of Mathematics - ISBN 1402006098. See original article