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arxiv: 1001.2830 · v3 · pith:WEZ2JEA3new · submitted 2010-01-16 · 🧮 math.AG

GIT Compactifications of M_(0,n) from Conics

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keywords quotientsconicsdatamathbbresultadmitsanalogouscomes
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We study GIT quotients parametrizing n-pointed conics that generalize the GIT quotients $(\mathbb{P}^1)^n//SL2$. Our main result is that $\overline{M}_{0,n}$ admits a morphism to each such GIT quotient, analogous to the well-known result of Kapranov for the simpler $(\mathbb{P}^1)^n$ quotients. Moreover, these morphisms factor through Hassett's moduli spaces of weighted pointed rational curves, where the weight data comes from the GIT linearization data.

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