The automorphism group of M̄g,n

The automorphism group of M̄g,n
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M̄g,n 的自同构群

DOI:
10.1112/jlms/jdt057
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发表时间:
2011
期刊:
Journal of the London Mathematical Society
影响因子:
--
通讯作者:
Alex Massarenti
Alex Massarenti
中科院分区:
--
文献类型:
--
作者:
Alex Massarenti

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设g,n是Deligne-Mumford稳定的n点亏格g曲线的模栈参数化,M g,n是它的粗模空间:n点亏格g光滑曲线的模空间的Deligne-Mumford紧化。我们证明了对于任意g,n使得2g − 2 + n <$3,n的自同构群与n元Sn上的对称群同构,并计算了其余的情形。
Let ℳ¯g,n be the moduli stack parametrizing Deligne–Mumford stable n‐pointed genus g curves and let M¯g,n be its coarse moduli space: the Deligne–Mumford compactification of the moduli space of n‐pointed genus g smooth curves. We prove that the automorphism groups of ℳ¯g,n and M¯g,n are isomorphic to the symmetric group on n elements Sn for any g, n such that 2g − 2 + n ⩾ 3, and compute the remaining cases.