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1 vote
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Fundamental $1$-form for a Riemannian manifold?

Take a Hermitian manifold $(M,I,g)$ where $I$ is the complex structure and $g$ is the Hermitian metric. The associated fundamental $2$-form $ g(\cdot,I(\cdot)) $ captures a lot of the information abou …
Dick Johnson's user avatar
1 vote
1 answer
138 views

Quaternion-Sasakian manifolds and special holonomy Sasakian manifolds

What about special holonomy? Does there exist a notion of $Spin(7)$-Sasakian manifold. What about $G_2$-holonomy? Can one use find an even dimensional analogue? …
Dick Johnson's user avatar