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arXiv 1203.4686math.AG
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六点有理曲线模空间上的完全交线与可动曲线

Complete intersections and movable curves on the moduli space of six-pointed rational curves

Paul L. Larsen

摘要:

射影簇上的曲线称为可动的,如果它属于覆盖该簇的代数曲线族。通过研究复射影空间的爆破族上的完备交锥,包括稳定六点有理曲线的模空间$\bar{M}_{0,6}$和四点有理曲线的全多面体或Losev-Manin模空间,讨论了可动曲线的锥何时可以在没有覆盖族存在性陈述的情况下刻画.我们的主要结果是,可移动的和完整的相交锥重合的复曲面的成员,这个家庭,但不同的非复曲面的成员,$\bar{M}_{0,6}$。证明是通过一个算法,适用于更大的普遍性。我们还给出了一个例子,这两个锥不同的投射复曲面三倍。

英文摘要:

A curve on a projective variety is called movable if it belongs to an algebraic family of curves covering the variety. We consider when the cone of movable curves can be characterized without existence statements of covering families by studying the complete intersection cone on a family of blow-ups of complex projective space, including the moduli space of stable six-pointed rational curves, $\bar{M}_{0,6}$, and the permutohedral or Losev-Manin moduli space of four-pointed rational curves. Our main result is that the movable and complete intersection cones coincide for the toric members of this family, but differ for the non-toric member, $\bar{M}_{0,6}$. The proof is via an algorithm that applies in greater generality. We also give an example of a projective toric threefold for which these two cones differ.

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