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arXiv math/9805114math.AGhep-th
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Virasoro约束与Hodge丛的Chern类

Virasoro constraints and the Chern classes of the Hodge bundle

E. Getzler, R. Pandharipande

摘要:

我们分析了江口、堀和熊的Virasoro猜想对Gromov-Witten不变量的推论,在零次映射到流形CP ^1和CP ^2(或者更一般地,光滑的射影曲线和光滑的单连通投射曲面)的情况下。我们得到的预测涉及交叉口的psi和lambda类的紧化M_{g,n}。特别地,我们证明了对CP^2的Virasoro猜想蕴涵了对M_g的重言Chow环的Faber猜想的数值部分.

英文摘要:

We analyse the consequences of the Virasoro conjecture of Eguchi, Hori and Xiong for Gromov-Witten invariants, in the case of zero degree maps to the manifolds CP^1 and CP^2 (or more generally, smooth projective curves and smooth simply-connected projective surfaces). We obtain predictions involving intersections of psi and lambda classes on the compactification of M_{g,n}. In particular, we show that the Virasoro conjecture for CP^2 implies the numerical part of Faber's conjecture on the tautological Chow ring of M_g.

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