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arXiv 1301.4409math.AGmath.ATmath.CV
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对称曲线模的亏格镇定

Genus stabilization for moduli of curves with symmetries

Fabrizio Catanese, Michael Lönne, Fabio Perroni

摘要:

在arXiv:1206.5498中,我们为有限群G在代数曲线上的忠实作用引入了一个新的同调不变量$\e$。我们在这里表明,模空间的曲线承认一个忠实的作用有限群G具有固定的同调不变量$\e$,如果亏格g'的商曲线是足够大的,是不可约的(和非空的,如果类满足的条件,我们定义为“可容许”)。在非分歧情形下,Dunfield和Thurston利用G的第二同调群中的经典不变量H_2(G,\ZZ)证明了类似的结果。我们实现了我们的结果表明,稳定类是双射的一组容许类$\e$。

英文摘要:

In a previous paper, arXiv:1206.5498, we introduced a new homological invariant $\e$ for the faithful action of a finite group G on an algebraic curve. We show here that the moduli space of curves admitting a faithful action of a finite group G with a fixed homological invariant $\e$, if the genus g' of the quotient curve is sufficiently large, is irreducible (and non empty iff the class satisfies the condition which we define as 'admissibility'). In the unramified case, a similar result had been proven by Dunfield and Thurston using the classical invariant in the second homology group of G, H_2(G, \ZZ). We achieve our result showing that the stable classes are in bijection with the set of admissible classes $\e$.

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