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Holomorphic Torus Actions on Compact Locally Conformal Kähler Manifolds

Published online by Cambridge University Press:  04 December 2007

Yoshinobu Kamishima
Affiliation:
Department of Mathematics, Tokyo Metropolitan University, Minami-Ohsawa 1-1, Hachioji, Tokyo 192-0397 Japan. E-mail: kami@comp.metro-u.ac.jp
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Abstract

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Given a torus action (T2, M) on a smooth manifold, the orbit map evx(t)=t·x for each xM induces a homomorphism ev*: $\mathbb Z$2H1(M;$\mathbb Z$). The action is said to be Rank-k if the image of ev* has rank k ([les ]2) for each point of M. In particular, if ev* is a monomorphism, then the action is called homologically injective. It is known that a holomorphic complex torus action on a compact Kähler manifold is homologically injective. We study holomorphic complex torus actions on compact non-Kähler Hermitian manifolds. A Hermitian manifold is said to be a locally conformal Kähler if a lift of the metric to the universal covering space is conformal to a Kähler metric. We shall prove that a holomorphic conformal complex torus action on a compact locally conformal Kähler manifold M is Rank-1 provided that M has no Kähler structure.

Type
Research Article
Copyright
© 2000 Kluwer Academic Publishers