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arXiv 1506.03050math.AG
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实K3曲面上实有理曲线计数的定性问题

Qualitative aspects of counting real rational curves on real K3 surfaces

Viatcheslav Kharlamov, Rares Rasdeaconu

摘要:

我们研究定性方面的Welschinger样$\mathbb Z$ -值计数的实有理曲线的极化实$K3$表面。特别是,我们证明,相对于程度的极化,在对数尺度上,增长率的数量,这样的真正的有理曲线的增长率是,直到一个常数因子,增长率的数量复杂的有理曲线。我们指出了几个例子时,我们的计数提供的实际有理曲线的数量的下界是尖锐的。此外,我们表现出各种同余之间的真实和复杂的计数。

英文摘要:

We study qualitative aspects of the Welschinger-like $\mathbb Z$-valued count of real rational curves on primitively polarized real $K3$ surfaces. In particular, we prove that with respect to the degree of the polarization, at logarithmic scale, the rate of growth of the number of such real rational curves is, up to a constant factor, the rate of growth of the number of complex rational curves. We indicate a few instances when the lower bound for the number of real rational curves provided by our count is sharp. In addition, we exhibit various congruences between real and complex counts.

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