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arXiv math/0604548math.AG
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非双理性刚性的指数1的Fano变种的例子

Examples of Fano varieties of index one that are not birationally rigid

Ana-Maria Castravet

摘要:

Pukhlikov的一个猜想指出,一个至少维数为4且指数为1的光滑Fano簇是双有理刚性的。我们证明了一般成员的线性系的充分生成元的皮卡德群的模空间的稳定,秩二丛与固定行列式的奇数度曲线亏格至少为三,是不是双有理刚性。

英文摘要:

A conjecture of Pukhlikov states that a smooth Fano variety of dimension at least four and index one is birationally rigid. We show that a general member of the linear system given by the ample generator of the Picard group of the moduli space of stable, rank two bundles with fixed determinant of odd degree on a curve of genus at least three, is not birationally rigid.

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