The action of Sn on the cohomology of $$overline{M}_{0,n}(mathbb{R})$$

The action of Sn on the cohomology of $$overline{M}_{0,n}(mathbb{R})$$
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Sn 对 $$overline{M}_{0,n}(mathbb{R})$$ 上同调的作用

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发表时间:
2009
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通讯作者:
E. Rains
E. Rains
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作者:
E. Rains

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在Etingof,Henriques,Kamnitzer和作者最近的工作中,给出了具有n个标记点的稳定亏格为0的曲线的模空间上的真实的轨迹{M}_{0,n}({mathbb{R}})$$的有理上同调的一个表示和显式基.我们确定了Sn在这个空间上的作用(由标记点的排列引起)的分级特征,既以循环指数的体积公式的形式,又作为给定循环类型上的特征值的显式乘积公式。
Abstract.In recent work by Etingof, Henriques, Kamnitzer, and the author, a presentation and explicit basis was given for the rational cohomology of the real locus $$overline{M}_{0,n}({mathbb{R}})$$ of the moduli space of stable genus 0 curves with n marked points. We determine the graded character of the action of Sn on this space (induced by permutations of the marked points), both in the form of a plethystic formula for the cycle index, and as an explicit product formula for the value of the character on a given cycle type.