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VOL. 69 | 2016 Compactification by GIT-stability of the moduli space of abelian varieties
Iku Nakamura

Editor(s) Osamu Fujino, Shigeyuki Kondō, Atsushi Moriwaki, Masa-Hiko Saito, Kōta Yoshioka


The moduli space $\mathcal{M}_g$ of nonsingular projective curves of genus $g$ is compactified into the moduli $\overline{\mathcal{M}}_g$ of Deligne-Mumford stable curves of genus $g$. We compactify in a similar way the moduli space of abelian varieties by adding some mildly degenerating limits of abelian varieties.

A typical case is the moduli space of Hesse cubics. Any Hesse cubic is GIT-stable in the sense that its $\mathrm{SL}(3)$-orbit is closed in the semistable locus, and conversely any GIT-stable planar cubic is one of Hesse cubics. Similarly in arbitrary dimension, the moduli space of abelian varieties is compactified by adding only GIT-stable limits of abelian varieties (§ 14).

Our moduli space is a projective “fine” moduli space of possibly degenerate abelian schemes with non-classical non-commutative level structure over $\mathbf{Z}[\zeta_{N},1/N]$ for some $N\geq 3$. The objects at the boundary are singular schemes, called PSQASes, projectively stable quasi-abelian schemes.


Published: 1 January 2016
First available in Project Euclid: 4 October 2018

zbMATH: 1373.14031
MathSciNet: MR3586509

Digital Object Identifier: 10.2969/aspm/06910207

Primary: 14J10, 14K10, 14K25

Rights: Copyright © 2016 Mathematical Society of Japan


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