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arXiv math/0612668math.AGmath.NTmath.SG
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character簇的混合Hodge多项式

Mixed Hodge polynomials of character varieties

Tamas Hausel, Fernando Rodriguez-Villegas

摘要:

本文利用Lie型GL(n,F_q)有限有限域的特征标表和附录中N.卡茨我们从这个计算中推导出几个几何结果,例如,相应的PGL(n,C)-特征标簇的拓扑欧拉示性数的值。计算还导出了M_n上同调的几个猜想:关于其混合Hodge多项式的一个显式猜想,一个被证明的奇异Hard Lefschetz定理,以及一个关于M_n的纯部分与其绝对不可分解表示的猜想。我们证明了n = 2时的这些定理。

英文摘要:

We calculate the E-polynomials of certain twisted GL(n,C)-character varieties M_n of Riemann surfaces by counting points over finite fields using the character table of the finite group of Lie-type GL(n,F_q) and a theorem proved in the appendix by N. Katz. We deduce from this calculation several geometric results, for example, the value of the topological Euler characteristic of the associated PGL(n,C)-character variety. The calculation also leads to several conjectures about the cohomology of M_n: an explicit conjecture for its mixed Hodge polynomial; a conjectured curious Hard Lefschetz theorem and a conjecture relating the pure part to absolutely indecomposable representations of a certain quiver. We prove these conjectures for n = 2.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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