Direct computation of the degree 4 Gopakumar–Vafa invariant on a Calabi–Yau 3-fold

Direct computation of the degree 4 Gopakumar–Vafa invariant on a Calabi–Yau 3-fold
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直接计算 Calabi-Yau 3 倍上的 4 阶 Gopakumar-Vafa 不变量

DOI:
10.1016/j.geomphys.2012.01.003
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发表时间:
2012
影响因子:
1.5
通讯作者:
M. Sahin
M. Sahin
中科院分区:
数学3区
文献类型:
--
作者:
M. Sahin

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本文利用代数几何的工具,计算了P上Hilbert多项式4N+1的稳定层的模空间的拓扑Euler特征为192。这个欧拉特征等于局部P2的4次BPS(Gopakumar-Vafa)不变量的符号,是一个(非紧的)Calabi-Yau 3重。这是一个新的结果,验证了一个由物理驱动的猜想的例子。
In this work we compute the topological Euler characteristic of the moduli space of stable sheaves of Hilbert polynomial 4n+1 on P2to be 192, using tools of algebraic geometry. This Euler characteristic is equal up to sign to the degree 4 BPS (Gopakumar–Vafa) invariant of local P2, a (noncompact) Calabi–Yau 3-fold. This is a new result verifying an instance of conjecture motivated by physics.