English

GIT Compactifications of $M_{0,n}$ from Conics

Algebraic Geometry 2015-01-13 v3

Abstract

We study GIT quotients parametrizing n-pointed conics that generalize the GIT quotients (P1)n//SL2(\mathbb{P}^1)^n//SL2. Our main result is that M0,n\overline{M}_{0,n} admits a morphism to each such GIT quotient, analogous to the well-known result of Kapranov for the simpler (P1)n(\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.

Keywords

Cite

@article{arxiv.1001.2830,
  title  = {GIT Compactifications of $M_{0,n}$ from Conics},
  author = {Noah Giansiracusa and Matthew Simpson},
  journal= {arXiv preprint arXiv:1001.2830},
  year   = {2015}
}

Comments

15 pages, 5 figures; corrected inequality in Lemma 5.1, Int. Math. Res. Notices Vol. 2010

R2 v1 2026-06-21T14:35:38.083Z