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arXiv 0906.2657math.AG
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紧型曲线I模的Kappa环

The kappa ring of the moduli of curves of compact type: I

R. Pandharipande

摘要:

研究了Kappa类生成的紧型曲线模的重言式环的子代数在所有属中的性质。关系,通过虚拟几何构造的模的稳定concurents,用于获得最小集的发电机。计算了Kappa环的基和贝蒂数。给出并证明了高亏格Kappa环与亏格0环的一个普适性。Hodge积分的lambda_g公式作为最简单的推论而出现。

英文摘要:

The subalgebra of the tautological ring of the moduli of curves of compact type generated by the kappa classes is studied in all genera. Relations, constructed via the virtual geometry of the moduli of stable quotients, are used to obtain minimal sets of generators. Bases and Betti numbers of the kappa rings are computed. A universality property relating the higher genus kappa rings to the genus 0 rings is stated and proved in a sequel. The lambda_g formula for Hodge integrals arises as the simplest consequence.

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