Local properties of self-dual harmonic 2-forms on a 4-manifold

Local properties of self-dual harmonic 2-forms on a 4-manifold
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4-流形上自对偶调和 2-形式的局部性质

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发表时间:
1997
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通讯作者:
K. Honda
K. Honda
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作者:
K. Honda

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摘要证明了闭四维流形上自对偶调和2-形式的一个Moser型定理,并利用它对2-形式为零的奇异圆邻域上的局部形式进行了分类。去掉圆的邻域,我们得到了一个具有切触边界的辛流形--我们证明了在每一个S_1 × S_2上的切触形式,在稍加修改后,必定是两种可能性之一.
Abstract We prove a Moser-type theorem for self-dual harmonic 2-forms on closed 4-manifolds, and use it to classify local forms on neighborhoods of singular circles on which the 2-form vanishes. Removing neighborhoods of the circles, we obtain a symplectic manifold with contact boundary—we show that the contact form on each S1 × S2, after a slight modification, must be one of two possibilities.