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arXiv math/9806144math.AG
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射束是其乘积的线丛

Line bundles for which a projectivized jet bundle is a product

S. Di Rocco, A. J. Sommese

摘要:

本文刻划了复射影流形X上的全纯线丛L和H构成的三元组(X,L,H),使得对某个正整数k,L的第k个全纯喷丛J_k(L)同构于一个直和H+.+ H.给定由作为基和射影空间的乘积的射影化线丛所施加的几何约束,很自然地期望这只会在非常罕见的情况下发生。事实上,它表明X要么是阿贝尔簇,要么是射影空间。在前一种情况下,L \cong H是陈类零的任何线丛。在后一种情况下,k为正整数,L= O_{P^n}(q),其中J_k(L)=H+.+ H当且仅当H= O_{P^n}(q-k)且q \ge k或q \le-1。

英文摘要:

We characterize the triples (X,L,H), consisting of holomorphic line bundles L and H on a complex projective manifold X, such that for some positive integer k, the k-th holomorphic jet bundle of L, J_k(L), is isomorphic to a direct sum H+...+H. Given the geometrical constrains imposed by a projectivized line bundle being a product of the base and a projective space it is natural to expect that this would happen only under very rare circumstances. It is shown, in fact, that X is either an Abelian variety or projective space. In the former case L\cong H is any line bundle of Chern class zero. In the later case for k a positive integer, L=O_{P^n}(q) with J_k(L)=H+...+H if and only if H=O_{P^n}(q-k) and either q\ge k or q\le -1.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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