Nef cones of some Quot schemes on a Smooth Projective Curve
Nef cones of some Quot schemes on a Smooth Projective Curve
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平滑射影曲线上一些 Quot 方案的 Nef 锥体
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发表时间:
2020
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通讯作者:
Ronnie Sebastian
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作者:
Chandranandan Gangopadhyay;Ronnie Sebastian
Let $C$ be a smooth projective curve over $mathbb C$. Let $n,dgeq 1$. Let $mathcal Q$ be the Quot scheme parameterizing torsion quotients of the vector bundle $mathcal O^n_C$ of degree $d$. In this article we study the nef cone of $mathcal Q$. We give a complete description of the nef cone in the case of elliptic curves. We compute it in the case when $d=2$ and $C$ very general, in terms of the nef cone of the second symmetric product of $C$. In the case when $ngeq d$ and $C$ very general, we give upper and lower bounds for the Nef cone. In general, we give a necessary and sufficient criterion for a divisor on $mathcal Q$ to be nef.