arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2301.00883math.AG
收藏

极小投射丛维数与环面$2$ -Fano流形

The minimal projective bundle dimension and toric $2$-Fano manifolds

Carolina Araujo, Roya Beheshti, Ana-Maria Castravet, Kelly Jabbusch, Svetlana Makarova, Enrica Mazzon, Nivedita Viswanathan, Will Reynolds

摘要:

受环面$2$ -Fano流形分类问题的启发,我们引入了光滑射影环面簇的一个新的不变量--最小射影丛维数.这个不变量$m(X)\in\{1, \dots,\dim(X)\}$捕获了$X$上有理曲线的支配族的最小度,或者等价地,捕获了$X$的扇形的中心对称本原关系的最小长度。利用$m(X)\geq \dim(X)-2$对光滑射影环面簇进行了分类,并证明了在利用$m(X)\in\{1, \dim(X)-2,\dim(X)-1,\dim(X)\}$的光滑射影环面簇中,射影空间是唯一的$2$-Fano流形.

英文摘要:

Motivated by the problem of classifying toric $2$-Fano manifolds, we introduce a new invariant for smooth projective toric varieties, the minimal projective bundle dimension. This invariant $m(X)\in\{1, \dots,\dim(X)\}$ captures the minimal degree of a dominating family of rational curves on $X$ or, equivalently, the minimal length of a centrally symmetric primitive relation for the fan of $X$. We classify smooth projective toric varieties with $m(X)\geq \dim(X)-2$, and show that projective spaces are the only $2$-Fano manifolds among smooth projective toric varieties with $m(X)\in\{1, \dim(X)-2,\dim(X)-1,\dim(X)\}$.

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。

↑