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Plurisubharmonic functions on a neighborhood of a torus leaf of a certain class of foliations

  • Takayuki Koike EMAIL logo
Published/Copyright: July 26, 2019

Abstract

Let C be a smooth elliptic curve embedded in a smooth complex surface X such that C is a leaf of a suitable holomorphic foliation of X. We investigate the complex analytic properties of a neighborhood of C under some assumptions on the complex dynamical properties of the holonomy function. As an application, we give an example of (C,X) in which the line bundle [C] is formally flat along C, however it does not admit a C Hermitian metric with semi-positive curvature. We also exhibit a family of embeddings of a fixed elliptic curve for which the positivity of normal bundles does not behave in a simple way.

MSC 2010: 32J25; 14C20

Communicated by Shigeharu Takayama


Award Identifier / Grant number: 25-2869

Funding statement: The author is supported by the Grant-in-Aid for Scientific Research (KAKENHI No. 25-2869)

Acknowledgements

The author would like to give heartful thanks to Professor Shigeharu Takayama and Professor Tetsuo Ueda whose comments and suggestions were of inestimable value. He is also indebted to Professor Benoît Claudon, who kindly gave me information about the paper [15]. He also thanks Professor Masanori Adachi, Dr. Ryosuke Nomura, and Professor Noboru Ogawa[1] for helpful comments and warm encouragements.

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Received: 2018-09-28
Revised: 2019-03-28
Published Online: 2019-07-26
Published in Print: 2019-11-01

© 2019 Walter de Gruyter GmbH, Berlin/Boston

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