arXivDaily arXiv每日学术速递 周一至周五更新
arXiv math/0311358math.AG
收藏

亏格为零的稳定n点曲线的模空间的幂函数的有效锥

Effective cones of quotients of moduli spaces of stable n-pointed curves of genus zero

William F. Rulla

摘要:

设X_n:= \bar M_{0,n},n点稳定亏格零曲线的模空间,X_{n,m}是X_n在对称群S_{n-m}作用于最后n-m个标记点上的商.计算了X_{n,m}(m = 0,1,2)的有效因子锥.利用这一方法,计算了m = 0,1时,由移动线性系的因子生成的锥Mov(X_{n,m})的上界,以及\bar M_g和\bar M_{g,1}的充分因子的锥上的诱导界.作为应用,详细分析了\bar M_{2,1}的有效因子锥.

英文摘要:

Let X_n := \bar M_{0,n}, the moduli space of n-pointed stable genus zero curves, and let X_{n,m} be the quotient of X_n by the action of the symmetric group S_{n-m} on the last n-m marked points. The cones of effective divisors of X_{n,m}, m = 0,1,2, are calculated. Using this, upper bounds for the cones Mov(X_{n,m}) generated by divisors with moving linear systems are calculated, m = 0,1, along with the induced bounds on the cones of ample divisors of \bar M_g and \bar M_{g,1}. As an application, the cone of effective divisors of \bar M_{2,1} is analyzed in detail.

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。

↑