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arXiv 1402.5740math.AGmath.CV
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关于四次双固体的整体变形

On Global Deformations of Quartic Double Solids

Tobias Dorsch

摘要:

证明了四次二重体的光滑整体变形,即沿光滑四次体分支的$\mathbb P^3$的双重覆盖,在不假设整体变形的射影性的情况下,仍然是四次二重体.对于$\mathbb P^ 5$中的两个二次曲面的光滑相交也给出了类似的结果,但这要容易得多。在一个弱形式下,这推广了J.Kollár和I. Nakamura关于Moishezon流形同胚于某些Fano三重流形的结果,并进一步证明了Picard秩$1$的Fano流形的整体变形是否是Fano流形本身.

英文摘要:

It is shown that a smooth global deformation of quartic double solids, i.e. double covers of $\mathbb P^3$ branched along smooth quartics, is again a quartic double solid without assuming the projectivity of the global deformation. The analogous result for smooth intersections of two quadrics in $\mathbb P^ 5$ is also shown, which is, however, much easier. In a weak form this extends results of J. Kollár and I. Nakamura on Moishezon manifolds that are homeomorphic to certain Fano threefolds and it gives some further evidence for the question whether global deformations of Fano manifolds of Picard rank $1$ are Fano themselves.

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